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Animals with Scientific Names beginning with the letter O

Taxonomy

Kingdom: Animalia

Phylum: Arthropoda

Subphylum: Hexapoda

Class: Insecta

Subclass: Pterygota

Order: Orthoptera

Suborder: Caelifera

Animals with Scientific Names beginning with the letter O

  • Obelus despreauxii
  • Oberea erythrocephala (Leafy Spurge Stem Boring Beetle)
  • Oblada melanura (Saddled seabream)
  • Obliquaria reflexa (Threehorn Wartyback)
  • Obliquichthys maryannae (Oblique-swimming triplefin)
  • Obliquogobius cometes
  • Obliquogobius turkayi
  • Obovaria jacksoniana (Southern Hickorynut)
  • Obovaria olivaria (Hickorynut)
  • Obovaria retusa (Ring Pink)
  • Obovaria rotulata (Round Ebonyshell)
  • Obovaria subrotunda (Round Hickorynut)
  • Obovaria unicolor (Alabama Hickorynut)
  • Ocadia glyphistoma
  • Ocadia philippeni (Philippen's Stripe-necked Turtle)
  • Ocadia sinensis (Chinese Stripe-necked Turtle, Chinese Striped-necked Turtle)
  • Occella dodecaedron (Bering Poacher)
  • Occella iburia
  • Occella impi (Pixie Poacher)
  • Occella kasawae
  • Occella kasawai
  • Occella kuronumai
  • Occella verrucosa (Warty Poacher)
  • Occidentalia comptulatalis
  • Occidentalia comptulatalis
  • Occidozyga baluensis
  • Occidozyga borealis
  • Occidozyga celebensis
  • Occidozyga diminutivus
  • Occidozyga floresianus
  • Occidozyga laevis
  • Occidozyga lima
  • Occidozyga magnapustulosus
  • Occidozyga martensii
  • Occidozyga semipalmatus
  • Occidozyga sumatrana
  • Occidozyga vittatus
  • Occirhenea georgiana
  • Oceanites gracilis (White-vented Storm-petrel)
  • Oceanites gracilis (Eliot's Storm Petrel)
  • Oceanites oceanicus (Wilson's Storm-petrel)
  • Oceanodroma castro (Band-rumped Storm Petrel, Madeiran Storm Petrel)
  • Oceanodroma furcata (Oceanodroma Homochroa, Ashy Storm-Petrel)
  • Oceanodroma hornbyi (Ringed Storm Petrel)
  • Oceanodroma leucorhoa (Leach's Storm Petrel)
  • Oceanodroma macrodactyla (Guadalupe Storm Petrel)
  • Oceanodroma markhami (Markham's Storm Petrel)
  • Oceanodroma matsudairae (Matsudaira's Storm Petrel)
  • Oceanodroma melania (Black Storm-petrel, Black Storm-Petrel)
  • Oceanodroma microsoma (Least Storm-petrel, Least Storm-Petrel)
  • Oceanodroma monorhis (Swinhoe's Storm Petrel)
  • Oceanodroma tethys (Wedge-rumped Storm-petrel)
  • Oceanodroma tethys (Galapagos Storm Petrel)
  • Oceanodroma tristrami (Sooty Storm-petrel, Tristram's Storm-petrel)
  • Ocenebra lurida (Lurid Rocksnail, Lurid Rock Snail)
  • Ochetobius elongatus
  • Ochmacanthus alternus
  • Ochmacanthus batrachostoma
  • Ochmacanthus flabelliferus
  • Ochmacanthus orinoco
  • Ochmacanthus reinhardtii
  • Ochotona cansus (Gansu Pika)
  • Ochotona collaris (Collared Pika)
  • Ochotona curzoniae (Black-lipped Pika)
  • Ochotona dauurica (Daurian Pika)
  • Ochotona erythrotis (Chinese Red Pika)
  • Ochotona forresti (Forrest's Pika)
  • Ochotona gaoligongensis (Gaoligong Pika)
  • Ochotona gloveri (Glover's Pika)
  • Ochotona himalayana (Himalayan Pika)
  • Ochotona hoffmanni
  • Ochotona huangensis (Huanghe Pika)
  • Ochotona hyperborea (Northern Pika)
  • Ochotona iliensis (Ili Pika)
  • Ochotona koslowi (Koslov's Pika, Kozlov's Pika)
  • Ochotona ladacensis (Ladak Pika)
  • Ochotona macrotis (Large-eared Pika)
  • Ochotona muliensis (Muli Pika)
  • Ochotona nubrica (Nubra Pika)
  • Ochotona pallasi (Pallas's Pika)
  • Ochotona princeps (American Pika, Pika, A Pika, Wasatch Pika)
  • Ochotona princeps (American Pika)
  • Ochotona princeps (Lasal Pika)
  • Ochotona princeps (Goat Peak Pika)
  • Ochotona princeps (Bighorn Mountain Pika)
  • Ochotona princeps (A Pika)
  • Ochotona pusilla (Steppe Pika)
  • Ochotona roylei (Royle's Pika)
  • Ochotona rufescens (Afghan Pika)
  • Ochotona rutila (Turkestan Red Pika)
  • Ochotona thomasi (Thomas' Pika, Thomas's Pika)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochropleura plecta (Flame-shouldered Dart)
  • Ochrotomys nuttalli (Golden Mouse)
  • Ochrotomys nuttalli (Golden Mouse, Golden Mouse)
  • Ochrotrichia alexanderi (A Caddisfly)
  • Ochrotrichia alsea (Alsea Ochrotrichian Micro Caddisfly)
  • Ochrotrichia anisca (A Purse Casmaker Caddisfly)
  • Ochrotrichia apalachicola (A Caddisfly)
  • Ochrotrichia argentea (A Caddisfly)
  • Ochrotrichia arva (A Caddisfly)
  • Ochrotrichia buccata (A Caddisfly)
  • Ochrotrichia burdicki (A Caddisfly)
  • Ochrotrichia capitana (A Caddisfly)
  • Ochrotrichia confusa (A Caddisfly)
  • Ochrotrichia contorta (Contorted Ochrotrichian Micro Caddisfly)
  • Ochrotrichia dactylophora (A Caddisfly)
  • Ochrotrichia dardeni (A Caddisfly)
  • Ochrotrichia denningi (A Caddisfly)
  • Ochrotrichia eliaga (A Purse Casmaker Caddisfly)
  • Ochrotrichia elongiralla (A Caddisfly)
  • Ochrotrichia felipe (A Caddisfly)
  • Ochrotrichia graysoni (A Caddisfly)
  • Ochrotrichia guadalupensis (A Caddisfly)
  • Ochrotrichia hadria (A Caddisfly)
  • Ochrotrichia honeyi (A Caddisfly)
  • Ochrotrichia ildria (A Caddisfly)
  • Ochrotrichia lometa (A Caddisfly)
  • Ochrotrichia lucia (A Caddisfly)
  • Ochrotrichia mono (A Caddisfly)
  • Ochrotrichia nacora (A Caddisfly)
  • Ochrotrichia okaloosa (A Caddisfly)
  • Ochrotrichia okanoganensis (A Caddisfly)
  • Ochrotrichia oregona (A Caddisfly)
  • Ochrotrichia phenosa (Deschutes Ochrotrichian Micro Caddisfly)
  • Ochrotrichia potomus (A Caddisfly)
  • Ochrotrichia provosti (Provost's Ochrotrichian Caddisfly)
  • Ochrotrichia quadrispina (A Caddisfly)
  • Ochrotrichia riesi (A Purse Casmaker Caddisfly)
  • Ochrotrichia robisoni (A Caddisfly)
  • Ochrotrichia rothi (A Caddisfly)
  • Ochrotrichia salaris (A Caddisfly)
  • Ochrotrichia shawnee (A Purse Casmaker Caddisfly)
  • Ochrotrichia spinosa (A Purse Casmaker Caddisfly)
  • Ochrotrichia spinulata (A Caddisfly)
  • Ochrotrichia stylata (A Caddisfly)
  • Ochrotrichia susanae (A Caddisfly)
  • Ochrotrichia tarsalis (A Caddisfly)
  • Ochrotrichia tenuata (A Caddisfly)
  • Ochrotrichia trapoiza (A Caddisfly)
  • Ochrotrichia tuscaloosa (A Caddisfly)
  • Ochrotrichia unio (A Caddisfly)
  • Ochrotrichia vertreesi (Vertrees's Ochrotrichian Micro Caddisfly)
  • Ochrotrichia weddleae (A Caddisfly)
  • Ochrotrichia weoka (A Caddisfly)
  • Ochrotrichia wojcickyi (A Caddisfly)
  • Ochrotrichia xena (A Purse Casmaker Caddisfly)
  • Ochrotrichia zioni (A Purse Casemaker Caddisfly)
  • Ochthebius benefossus (A Minute Moss Beetle)
  • Ochthebius benefossus (A Minute Moss Beetle)
  • Ochthebius kaszabi (A Minute Moss Beetle)
  • Ochthebius putnamensis (Indiana Ochthebius Minute Moss Beetle)
  • Ochthebius putnamensis (Indiana Ochthebius Minute Moss Beetle)
  • Ochthebius putnamensis (Indiana Ochthebius Minute Moss Beetle)
  • Ochthebius putnamensis (Indiana Ochthebius Minute Moss Beetle)
  • Ochthoeca cinnamomeiventris
  • Ochthoeca fumicolor
  • Ochthoeca leucophrys
  • Ochthoeca oenanthoides
  • Ochthoeca piurae (Piura Chat-tyrant)
  • Ochthoeca rufipectoralis
  • Ochthoeca salvini
  • Ochthornis littoralis
  • Oconoperla innubila (A Stonefly)
  • Ocosia apia (Stoutspine waspfish)
  • Ocosia fasciata
  • Ocosia possi
  • Ocosia ramaraoi
  • Ocosia spinosa
  • Ocosia vespa
  • Ocosia zaspilota (Polka dot waspfish)
  • Ocreatus underwoodii
  • Octodon bridgesi (Bridges's Degu)
  • Octodon degus (Degu)
  • Octodon lunatus (Moon-toothed Degu)
  • Octodon pacificus
  • Octodontomys gliroides (Mountain Degu)
  • Octogomphus specularis (Grappletail)
  • Octomys mimax (Viscacha Rat)
  • Octopodus vulgaris (Common Octopus)
  • Octopus dofleini
  • Octopus joubini (Atlantic Pygmy Octopus)
  • Octopus rubescens (East Pacific Red Octopus)
  • Octopus vulgaris (Common Octopus)
  • Octotemnus laevis (A Minute Tree-fungus Beetle)
  • Octotemnus laevis (A Minute Tree-fungus Beetle)
  • Octotemnus laevis (A Minute Tree-fungus Beetle)
  • Oculocincta squamifrons
  • Ocyalus latirostris
  • Ocyceros birostris
  • Ocyceros gingalensis
  • Ocyceros griseus (Malabar Grey-hornbill)
  • Ocynectes maschalis
  • Ocynectes modestus
  • Ocyphaps lophotes
  • Ocypode gaudichaudii (Ghost Crab)
  • Ocyurus chrysurus (Yellowtail Snapper)
  • Odax acroptilus (Rainbow cale)
  • Odax cyanoallix (Bluefinned butterfish)
  • Odax cyanomelas (Herring Cale)
  • Odax pullus (Butterfish, Greenbone)
  • Odaxothrissa losera (Losera Fangtooth Pellonuline)
  • Odaxothrissa vittata (Regan's Fangtooth Pellonuline)
  • Odobenus rosmarus (Walrus)
  • Odocoileus hemionus (Mule Deer)
  • Odocoileus virginianus (Key Deer)
  • Odondebuenia balearica (Coralline goby)
  • Odontamblyopus lacepedii
  • Odontamblyopus rebecca
  • Odontamblyopus roseus
  • Odontamblyopus rubicundus
  • Odontamblyopus tenuis
  • Odontanthias dorsomaculatus
  • Odontanthias elizabethae
  • Odontanthias fuscipinnis
  • Odontaspis ferox (Bumpytail Raggedtooth, Ragged-tooth Shark, Smalltooth Sand Tiger)
  • Odontaspis noronhai (Bigeye Sand Shark, Bigeye Sandtiger)
  • Odontaspis taurus (Sand Tiger)
  • Odonteleotris canina
  • Odonteleotris macrodon (Gangetic sleeper)
  • Odonteleotris polylepis
  • Odontesthes argentinensis
  • Odontesthes bicudo
  • Odontesthes bonariensis (Pejerrey)
  • Odontesthes brevianalis
  • Odontesthes gracilis
  • Odontesthes hatcheri
  • Odontesthes humensis
  • Odontesthes incisa
  • Odontesthes ledae
  • Odontesthes mauleanum
  • Odontesthes mirinensis
  • Odontesthes nigricans
  • Odontesthes orientalis
  • Odontesthes perugiae
  • Odontesthes piquava
  • Odontesthes platensis
  • Odontesthes regia (Silverside)
  • Odontesthes retropinnis
  • Odontesthes smitti
  • Odontesthes wiebrichi
  • Odontobutis aspro
  • Odontobutis haifengensis
  • Odontobutis hikimius
  • Odontobutis interruptain
  • Odontobutis obscura
  • Odontobutis platycephala
  • Odontobutis potamophila
  • Odontobutis sinensis
  • Odontobutis yaluensis
  • Odontocharacidium aphanes (Green dwarf tetra)
  • Odontocorynus denticornis (A Weevil)
  • Odontocorynus scutellumalbum (A Weevil)
  • Odontodiaptomus thomseni
  • Odontognathus compressus (Caribbean Longfin Herring)
  • Odontognathus mucronatus (Guiana Longfin Herring)
  • Odontognathus panamensis (Panama Longfin Herring)
  • Odontoliparis ferox
  • Odontomacrurus murrayi (Roundhead grenadier)
  • Odontophorus atrifrons (Black-fronted Wood-quail)
  • Odontophorus balliviani
  • Odontophorus capueira
  • Odontophorus columbianus (Venezuelan Wood-quail)
  • Odontophorus dialeucos (Tacarcuna Wood-quail)
  • Odontophorus erythrops
  • Odontophorus gujanensis
  • Odontophorus guttatus
  • Odontophorus hyperythrus (Chestnut Wood-quail)
  • Odontophorus leucolaemus (Black-breasted Wood-quail)
  • Odontophorus melanonotus (Dark-backed Wood-quail)
  • Odontophorus melanotis
  • Odontophorus speciosus
  • Odontophorus stellatus
  • Odontophorus strophium (Gorgeted Wood-quail)
  • Odontophrynus achalensis
  • Odontophrynus americanus
  • Odontophrynus barrioi
  • Odontophrynus carvalhoi
  • Odontophrynus cordobae
  • Odontophrynus cultripes
  • Odontophrynus lavillai
  • Odontophrynus moratoi
  • Odontophrynus occidentalis
  • Odontophrynus salvatori
  • Odontopodisma montana
  • Odontopodisma rubripes
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopus calceatus (Yellow Poplar Weevil)
  • Odontopyxis trispinosa (Pygmy Poacher)
  • Odontorchilus branickii
  • Odontorchilus cinereus
  • Odontoscion dentex (Reef Croaker)
  • Odontoscion eurymesops (Galapagos croaker)
  • Odontoscion xanthops (Yelloweye croaker)
  • Odontostilbe dialeptura
  • Odontostilbe dierythrura
  • Odontostilbe fugitiva
  • Odontostilbe gracilis
  • Odontostilbe littoris
  • Odontostilbe microcephala
  • Odontostilbe mitoptera
  • Odontostilbe paraguayensis
  • Odontostilbe pequira
  • Odontostilbe roloffi
  • Odontostilbe stenodon
  • Odontostoechus lethostigmus
  • Odontostomias masticopogon
  • Odontostomias micropogon
  • Odontostomops normalops (Undistinguished sabretooth)
  • Odonus niger (Redtoothed Filefish, Redtoothed Filefish)
  • Oecanthus argentinus (Prairie Tree Cricket)
  • Oecanthus exclamationis (Davis Tree Cricket)
  • Oecanthus fultoni (Snowy Tree Cricket)
  • Oecanthus laricis (Laricis Tree Cricket)
  • Oecanthus latipennis (Broad-winged Tree Cricket)
  • Oecanthus nigricornis (Blackhorned Tree Cricket, Black-horned Tree Cricket)
  • Oecanthus nigricornis (Blackhorned Tree Cricket, Black-horned Tree Cricket)
  • Oecanthus nigricornis (Blackhorned Tree Cricket, Black-horned Tree Cricket)
  • Oecanthus nigricornis (Blackhorned Tree Cricket, Black-horned Tree Cricket)
  • Oecanthus niveus (Narrow Winged Tree Cricket)
  • Oecanthus pini (Pine Tree Cricket)
  • Oecanthus quadripunctatus (Fourspotted Tree Cricket, Four-spotted Tree Cricket)
  • Oecanthus quadripunctatus (Fourspotted Tree Cricket, Four-spotted Tree Cricket)
  • Oecanthus quadripunctatus (Fourspotted Tree Cricket, Four-spotted Tree Cricket)
  • Oecanthus quadripunctatus (Fourspotted Tree Cricket, Four-spotted Tree Cricket)
  • Oecetis albescens (A Caddisfly)
  • Oecetis arizonica (A Caddisfly)
  • Oecetis avara (A Caddisfly)
  • Oecetis cinerascens (A Caddisfly)
  • Oecetis daytona (A Caddisfly)
  • Oecetis disjuncta (A Caddisfly)
  • Oecetis ditissa (A Caddisfly)
  • Oecetis eddlestoni (A Caddisfly)
  • Oecetis georgia (A Caddisfly)
  • Oecetis immobilis (A Caddisfly)
  • Oecetis inconspicua (A Caddisfly)
  • Oecetis metlacensis (A Caddisfly)
  • Oecetis morsei (Morse's Long-horn Sedge)
  • Oecetis nocturna (A Caddisfly)
  • Oecetis ochracea (A Caddisfly)
  • Oecetis osteni (A Caddisfly)
  • Oecetis ouachita (A Caddisfly)
  • Oecetis ozarkensis (A Caddisfly)
  • Oecetis parva (Little Oecetis Longhorn Caddsifly)
  • Oecetis persimilis (A Caddisfly)
  • Oecetis porteri (Porter's Long-horn Sedge)
  • Oecetis pratelia (Little Meadow Long-horned Caddisfly)
  • Oecetis scala (A Caddisfly)
  • Oecomys bicolor (Bicolored Arboreal Rice Rat)
  • Oecomys cleberi (Cleber's Arboreal Rice Rat)
  • Oecomys concolor (Unicolored Arboreal Rice Rat)
  • Oecomys flavicans (Yellow Arboreal Rice Rat)
  • Oecomys mamorae (Mamore Arboreal Rice Rat)
  • Oecomys paricola (Brazilian Arboreal Rice Rat)
  • Oecomys phaeotis (Dusky Arboreal Rice Rat)
  • Oecomys rex (King Arboreal Rice Rat)
  • Oecomys roberti (Robert's Arboreal Rice Rat)
  • Oecomys rutilus (Red Arboreal Rice Rat)
  • Oecomys speciosus (Arboreal Rice Rat)
  • Oecomys superans (Foothill Arboreal Rice Rat)
  • Oecomys trinitatis (Trinidad Arboreal Rice Rat)
  • Oedalechilus labeo (Boxlip mullet)
  • Oedalechilus labiosus (Fat Mullet)
  • Oedaleonotus borckii (A Grasshopper)
  • Oedaleonotus enigma (Valley Grasshopper)
  • Oedaleonotus pacificus (A Grasshopper)
  • Oedaleonotus phryneicus (A Grasshopper)
  • Oedaleonotus tenuipennis (A Grasshopper)
  • Oedaleonotus truncatus (A Grasshopper)
  • Oedaleonotus werneri (A Grasshopper)
  • Oedemasylus laysanensis
  • Oedipina alfaroi
  • Oedipina altura
  • Oedipina carablanca
  • Oedipina collaris
  • Oedipina complex
  • Oedipina cyclocauda
  • Oedipina elongata
  • Oedipina ignea
  • Oedipina parvipes
  • Oedipina paucidentata
  • Oedipina poelzi
  • Oedipina pseudouniformis
  • Oedipina stuarti
  • Oedipina taylori
  • Oedipina uniformis
  • Oedistoma pygmaeum
  • Oemopteryx contorta (A Stonefly, Dark Willowfly)
  • Oemopteryx fosketti (A Stonefly)
  • Oemopteryx glacialis (A Stonefly, Canadian Willowfly)
  • Oemopteryx vanduzeea (A Stonefly)
  • Oena capensis
  • Oenanthe alboniger
  • Oenanthe bottae
  • Oenanthe cypriaca
  • Oenanthe deserti
  • Oenanthe finschii
  • Oenanthe heuglini
  • Oenanthe hispanica
  • Oenanthe isabellina
  • Oenanthe leucopyga
  • Oenanthe leucura
  • Oenanthe lugens
  • Oenanthe lugentoides
  • Oenanthe lugubris
  • Oenanthe moesta
  • Oenanthe monacha
  • Oenanthe monticola
  • Oenanthe oenanthe (Northern Wheatear)
  • Oenanthe phillipsi
  • Oenanthe picata
  • Oenanthe pileata
  • Oenanthe pleschanka
  • Oenanthe xanthoprymna
  • Oenchroma vinaria (Pink-Bellied moth)
  • Oeneis chryxus (Chrysus Artic, Chryxus Arctic, Chryxus Arctic, Olympic Arctic)
  • Oeneis jutta (Rural Skipper)
  • Oeneis melissa (Melissa Artic, Melissa Arctic, White Mountain Butterfly)
  • Oeneis polixenes (Wandering Skipper)
  • Oeneis rosovi (Philip's Arctic)
  • Oenomys hypoxanthus (Rufous-nosed Rats)
  • Oenomys ornatus (Ghana Rufous-nosed Rat)
  • Oestophora ortizi
  • Offachloritis dryanderensis
  • Ogasawarana arata
  • Ogasawarana capsula
  • Ogasawarana chichijimana
  • Ogasawarana comes
  • Ogasawarana discrepans
  • Ogasawarana habei
  • Ogasawarana hirasei
  • Ogasawarana metamorpha
  • Ogasawarana microtheca
  • Ogasawarana nitida
  • Ogasawarana ogasawarana
  • Ogasawarana optima
  • Ogasawarana rex
  • Ogasawarana yoshiwarana
  • Ogcocephalus corniger (Longnose Batfish)
  • Ogcocephalus cubifrons
  • Ogcocephalus darwini (Galápagos batfish)
  • Ogcocephalus declivirostris (Slantbrow Batfish)
  • Ogcocephalus nasutus (Shortnose Batfish)
  • Ogcocephalus notatus
  • Ogcocephalus pantostictus (Spotted batfish, Spotted Batfish)
  • Ogcocephalus parvus (Roughback Batfish)
  • Ogcocephalus porrectus
  • Ogcocephalus pumilus
  • Ogcocephalus radiatus (Polka-dot Batfish, Spotted Batfish)
  • Ogcocephalus rostellum (Palefin Batfish)
  • Ogcocephalus vespertilio (Longnose Batfish)
  • Ogilbia cayorum (Key Brotula)
  • Ogilbia deroyi (Deroy's cuskeel)
  • Ogilbia galapagosensis (Galapagos cuskeel)
  • Ogilbia pearsei
  • Ogilbia ventralis (Gulf cuskeel)
  • Ogilbyina novaehollandiae (Multicolored dottyback)
  • Ogilbyina queenslandiae (Queensland dottyback)
  • Ogilbyina salvati
  • Ogilbyina velifera (Sailfin dottyback)
  • Ogmodon vitianus (Fiji Snake)
  • Ognorhynchus icterotis (Yellow-eared Conure)
  • Ohridohauffenia drimica
  • Oidiphorus brevis
  • Oidiphorus mcallisteri
  • Oikopleura dioica
  • Oikopleura fusiformis
  • Oikopleura labradoriensis
  • Oikopleura vanhoeffeni
  • Okamejei acutispina (Sharpspine skate)
  • Okamejei australis (Sydney skate)
  • Okamejei boesemani (Boeseman's skate)
  • Okamejei cerva (White-spotted skate)
  • Okamejei heemstrai (East African skate)
  • Okamejei hollandi (Yellow-spotted skate)
  • Okamejei kenojei (Ocellate spot skate)
  • Okamejei lemprieri (Australian thornback skate)
  • Okamejei meerdervoortii (Bigeye skate)
  • Okamejei pita (Pita skate)
  • Okamejei powelli (Indian ringed skate)
  • Okamejei schmidti (Browneye skate)
  • Okapia johnstoni (Okapi)
  • Olallamys albicauda (White-tailed Olalla Rat)
  • Olallamys edax (Greedy Olalla Rat)
  • Oleacina guadeloupensis
  • Oliarces clara (Lacewing or Ally)
  • Oliarus consimilis (Kauai Parti-colored Oliarus Planthopper)
  • Oliarus discrepans (A Cave Obligate Planthopper)
  • Oliarus lihue (A Cave Obligate Planthopper)
  • Oliarus myoporicola (Barber's Point Oliarus Planthopper)
  • Oliarus polyphemus (A Cave Obligate Planthopper)
  • Oliarus priola (Priolan Oliarus Planthopper)
  • Oligancistrus punctatissimus
  • Oligia bridghami (A Noctuid Moth)
  • Oligia chlorostigma (A Noctuid Moth)
  • Oligia exhausta (A Noctuid Moth)
  • Oligia illocata (Wandering Brocade)
  • Oligia marina
  • Oligia minuscula (Bog Oligia)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligia modica (Black-banded Brocade)
  • Oligoaeschna kunigamiensis
  • Oligobrycon microstomus
  • Oligocottus latifrons
  • Oligocottus maculosus (Tidepool Sculpin)
  • Oligocottus rimensis (Saddleback Sculpin)
  • Oligocottus rubellio (Rosy Sculpin)
  • Oligocottus snyderi (Fluffy Sculpin)
  • Oligodon nikhili
  • Oligolepis acutipennis (Barecheek Goby, Pointed Fin Goby)
  • Oligolepis cylindriceps
  • Oligolepis jaarmani
  • Oligolepis keiensis (Kei goby)
  • Oligolepis stomias
  • Oligomerus obtusus (A Deathwatch Beetle)
  • Oligomerus obtusus (A Deathwatch Beetle)
  • Oligomerus obtusus (A Deathwatch Beetle)
  • Oligoplites altus (Leatherjacket)
  • Oligoplites calcar
  • Oligoplites palometa (Maracaibo leatherjacket)
  • Oligoplites refulgens (Shortjaw leatherjack)
  • Oligoplites saliens (Sauteur)
  • Oligoplites saurus (Leatherjacket)
  • Oligoryzomys andinus (Andean Pygmy Rice Rat)
  • Oligoryzomys arenalis (Sandy Pygmy Rice Rat)
  • Oligoryzomys chacoensis (Chacoan Pygmy Rice Rat)
  • Oligoryzomys delticola (Delta Pygmy Rice Rat)
  • Oligoryzomys destructor (Destructive Pygmy Rice Rat)
  • Oligoryzomys eliurus (Brazilian Pygmy Rice Rat)
  • Oligoryzomys flavescens (Yellow Pygmy Rice Rat)
  • Oligoryzomys fulvescens (Fulvous Pygmy Rice Rat)
  • Oligoryzomys griseolus (Grayish Pygmy Rice Rat)
  • Oligoryzomys longicaudatus (Long-tailed Pygmy Rice Rat)
  • Oligoryzomys magellanicus (Magellanic Pygmy Rice Rat)
  • Oligoryzomys microtis (Small-eared Pygmy Rice Rat)
  • Oligoryzomys nigripes (Black-footed Pygmy Rice Rat)
  • Oligoryzomys vegetus (Sprightly Pygmy Rice Rat)
  • Oligoryzomys victus (St. Vincent Pygmy Rice Rat)
  • Oligosarcus acutirostris
  • Oligosarcus argenteus
  • Oligosarcus bolivianus
  • Oligosarcus brevioris
  • Oligosarcus hepsetus
  • Oligosarcus jenynsii
  • Oligosarcus longirostris
  • Oligosarcus macrolepis
  • Oligosarcus menezesi
  • Oligosarcus oligolepis
  • Oligosarcus paranensis
  • Oligosarcus pintoi
  • Oligosarcus planaltinae
  • Oligosarcus robustus
  • Oligosarcus schindleri
  • Oligosarcus solitarius
  • Oligosoma fallai (Falla's Skink)
  • Oligosoma gracilicorpus (Narrow-bodied Skink)
  • Oligosoma grande (Grand Skink)
  • Oligosoma homalonotum (Chevron Skink)
  • Oligosoma infrapunctatum (Speckled Skink)
  • Oligosoma microlepis (Small-scaled Skink)
  • Oligosoma notosaurus (Southern Skink)
  • Oligosoma otagense (Otago Skink)
  • Oligosoma striatum (Striped Skink)
  • Oligosoma waimatense (Scree Skink)
  • Olisthopus micans (A Ground Beetle)
  • Olisthopus parmatus (Ground Beetle)
  • Olivaichthys cuyanus
  • Olivaichthys mesembrinus
  • Olivaichthys viedmensis (Otuno)
  • Olivella biplicata (Purple Dwarf Olive, Purple olive shell, Purple olivella)
  • Olla v-nigrum (A Rove Beetle)
  • Olla v-nigrum
  • Oloplotosus luteus (Pale yellow tandan)
  • Oloplotosus mariae (Maria's tandan)
  • Oloplotosus torobo (Kutubu tandan)
  • Olor bewickii
  • Olor buccinator
  • Olor columbianus
  • Olor cygnus
  • Olyra burmanica (Longtail catfish)
  • Olyra horae
  • Olyra kempi
  • Olyra laticeps
  • Olyra longicauda
  • Olyra longicaudata
  • Oman ypsilon (Oman blenny)
  • Omegophora armilla (Ringed toadfish)
  • Omegophora cyanopunctata
  • Ommatophoca rossii (Bigeyed Seal, Ross Seal)
  • Omobranchus angelus
  • Omobranchus anolius (Crested Blenny, Oyster Blenny)
  • Omobranchus aurosplendidus
  • Omobranchus banditus (Bandit Blenny, Bandit Blenny)
  • Omobranchus elegans
  • Omobranchus elongatus (Cloister Blenny, Cloister Blenny)
  • Omobranchus fasciolatoceps
  • Omobranchus fasciolatus (Arab blenny)
  • Omobranchus ferox (Gossamer blenny)
  • Omobranchus germaini (Germain's blenny)
  • Omobranchus hikkaduwensis
  • Omobranchus lineolatus
  • Omobranchus loxozonus
  • Omobranchus mekranensis (Arab Blenny, Arab Blenny)
  • Omobranchus meniscus
  • Omobranchus obliquus (Zebra Blenny)
  • Omobranchus punctatus (Muzzled blenny)
  • Omobranchus robertsi
  • Omobranchus rotundiceps
  • Omobranchus rotundiceps
  • Omobranchus smithi
  • Omobranchus steinitzi
  • Omobranchus verticalis
  • Omobranchus woodi (Kappie Blenny, Kappie Blenny)
  • Omobranchus zebra
  • Omosita discoidea (A Sap Beetle)
  • Omosita discoidea (A Sap Beetle)
  • Omosita discoidea (A Sap Beetle)
  • Omosita discoidea (A Sap Beetle)
  • Omosita discoidea (A Sap Beetle)
  • Omosita discoidea (A Sap Beetle)
  • Omosudis lowii (Halterfish, Hammerjaw)
  • Omox biporos (Omox blenny)
  • Omox lupus
  • Omphalotropis albocarinata
  • Omphalotropis carolinensis
  • Omphalotropis cheynei
  • Omphalotropis cookei
  • Omphalotropis elegans
  • Omphalotropis elongatula
  • Omphalotropis erosa
  • Omphalotropis fragilis
  • Omphalotropis gracilis
  • Omphalotropis guamensis
  • Omphalotropis hieroglyphica
  • Omphalotropis howeinsulae
  • Omphalotropis laevigata
  • Omphalotropis laticosta
  • Omphalotropis latilabris
  • Omphalotropis mutica
  • Omphalotropis ochthogyra
  • Omphalotropis picta
  • Omphalotropis pilosa
  • Omphalotropis plicosa
  • Omphalotropis quadrasi
  • Omphalotropis semicostata
  • Omphalotropis striatapila
  • Omphalotropis submaritima
  • Omphalotropis suteri
  • Omphalotropis suturalis
  • Omphalotropis tumidula
  • Ompok bimaculatus (Butter Catfish, Butter Catfish, Glass Catfish, Glass Catfish)
  • Ompok binotatus
  • Ompok borneensis
  • Ompok canio
  • Ompok eugeneiatus
  • Ompok fumidus
  • Ompok goae
  • Ompok hypophthalmus
  • Ompok javanensis
  • Ompok jaynei
  • Ompok leiacanthus
  • Ompok malabaricus (Goan catfish)
  • Ompok miostoma
  • Ompok pabda (Pabdah catfish)
  • Ompok pabo (Pabo catfish)
  • Ompok pluriradiatus
  • Ompok sabanus
  • Ompok weberi
  • Omus ambiquus (A Tiger Beetle)
  • Omus edwardsi (A Tiger Beetle)
  • Omus horni (A Tiger Beetle)
  • Omus laevis (A Tiger Beetle)
  • Omus laticollis (A Tiger Beetle)
  • Omus punctifrons (A Tiger Beetle)
  • Omus sequoiarum (A Tiger Beetle)
  • Omus tularensis (A Tiger Beetle)
  • Omus vanlooi (A Tiger Beetle)
  • Onchotelson brevicaudatus
  • Onchotelson spatulatus
  • Oncideres cingulata (Twig Girdler)
  • Oncifelis colocolo (Pampas Cat)
  • Oncifelis geoffroyi (Geoffroy's Cat)
  • Oncifelis guigna (Kodkod)
  • Oncochila simplex (Lace Bug)
  • Onconotus servillei
  • Oncopeltus fasciatus (Large Milkweed Bug)
  • Oncopodura fenestra (A Cave Obligate Springtail)
  • Oncopodura hoffi (A Cave Obligate Springtail)
  • Oncopodura hubbardi (A Cave Springtail)
  • Oncopodura iowae (A Cave Obligate Springtail)
  • Oncopodura mala (Malheur Cave Springtail)
  • Oncopodura prietoi (A Cave Obligate Springtail)
  • Oncopodura subhoffi (A Springtail)
  • Oncopodura tunica (A Cave Obligate Springtail)
  • Oncopterus darwinii (Remo flounder)
  • Oncorhynchus chrysogaster (Mexican Golden Trout)
  • Oncorhynchus clarki (Cutthroat trout)
  • Oncorhynchus clarki
  • Oncorhynchus clarki (Colorado River Cutthroat)
  • Oncorhynchus clarkii (Cutthroat Trout)
  • Oncorhynchus formosanus
  • Oncorhynchus gilae (Apache Trout)
  • Oncorhynchus gorbuscha (Pink Salmon)
  • Oncorhynchus ishikawai (Satsukimasu salmon)
  • Oncorhynchus iwame (Iwame trout)
  • Oncorhynchus keta (Chum Salmon, Chum Salmon - Puget Sound/Straight of Georgia)
  • Oncorhynchus kisutch (Coho Salmon, Coho Salmon Or Silver Salmon, Coho Salmon or Silver Salmon, Rainbow Trout or Steelhead)
  • Oncorhynchus masou (Cherry Salmon, Masu, Masu Salmon)
  • Oncorhynchus masou
  • Oncorhynchus masou
  • Oncorhynchus masou (Cherry salmon)
  • Oncorhynchus masou
  • Oncorhynchus mykiss (Rainbow Trout, Redband Trout, Steelhead, California Golden Trout, Inland Redband Trout, Kern River Golden Trout, Rainbow Trout - Coastal, Steelhead - Klamath Mountains Province, Steelhead - Southern California, Steelhead - Central Valley, Steelhead - Uppe)
  • Oncorhynchus nerka (Blueback Salmon, Kokanee, Red Salmon, Sockeye Salmon, Sockeye Salmon Or Kokanee, Sockeye Salmon or Kokanee, Sockeye Salmon - Lake Pleasant, Sockeye Salmon - Quinalt Lake, Sockeye Salmon - Baker River)
  • Oncorhynchus rhodurus
  • Oncorhynchus tshawytscha (Chinook Salmon, Chinook Salmon Or King Salmon, Chinook Salmon, Chinook Salmon - Lower Columbia River, Chinook Salmon - Central Valley Spring Run, Chinook Salmon - Upper Columbia River Spring Run, Chinook Salmon - Central Valley Fall/late Fall Run, Chinook)
  • Oncostoma cinereigulare
  • Oncostoma olivaceum
  • Oncozygia clavicornis (A Turtle Bug)
  • Ondatra zibethicus (Muskrat)
  • Oneirodes acanthias (Pacific Dreamer)
  • Oneirodes alius
  • Oneirodes anisacanthus
  • Oneirodes appendixus
  • Oneirodes basili
  • Oneirodes bradburyae
  • Oneirodes bulbosus (Bulbfish, Dreamer, Bulbous Dreamer)
  • Oneirodes carlsbergi
  • Oneirodes clarkei
  • Oneirodes cristatus
  • Oneirodes dicromischus
  • Oneirodes epithales (Nightmare dreamer)
  • Oneirodes eschrichtii (Bulbous dreamer)
  • Oneirodes flagellifer
  • Oneirodes haplonema
  • Oneirodes heteronema
  • Oneirodes kreffti
  • Oneirodes luetkeni
  • Oneirodes macronema
  • Oneirodes macrosteus
  • Oneirodes melanocauda
  • Oneirodes micronema
  • Oneirodes mirus
  • Oneirodes myrionemus
  • Oneirodes notius
  • Oneirodes plagionema
  • Oneirodes posti
  • Oneirodes pterurus
  • Oneirodes rosenblatti
  • Oneirodes sabex
  • Oneirodes schistonema
  • Oneirodes schmidti
  • Oneirodes theodoritissieri
  • Oneirodes thompsoni (Spiny Dreamer)
  • Oneirodes thysanema
  • Oneirodes whitleyi
  • Onigocia bimaculata
  • Onigocia grandisquamis
  • Onigocia macrolepis (Notched flathead)
  • Onigocia oligolepis (Large-scale flathead)
  • Onigocia pedimacula
  • Onigocia spinosa
  • Onobops crassus (Spartina Hydrobe)
  • Onobops jacksoni (Fine-lined Hydrobe)
  • Onuxodon fowleri (Fowler's pearlfish)
  • Onuxodon margaritiferae (Clam Pearlfish)
  • Onuxodon parvibrachium (Oyster pearlfish)
  • Onychiurus casus (A Springtail)
  • Onychiurus encarpatus (A Springtail)
  • Onychiurus gelus (A Cave Obligate Springtail)
  • Onychiurus janus (A Cave Obligate Springtail)
  • Onychiurus obesus (A Cave Obligate Springtail)
  • Onychiurus oregonensis (A Cave Obligate Springtail)
  • Onychiurus paro (A Cave Obligate Springtail)
  • Onychiurus reluctus (A Springtail)
  • Onychobaris langei (Lange's el Segundo Dune Weevil)
  • Onychodiaptomus louisianensis
  • Onychogalea fraenata (Bridled Nail-tailed Wallaby)
  • Onychogalea lunata (Crescent Nail-tailed Wallaby)
  • Onychogalea unguifera
  • Onychognathus albirostris
  • Onychognathus blythii
  • Onychognathus frater (Socotra Starling)
  • Onychognathus fulgidus
  • Onychognathus morio
  • Onychognathus nabouroup
  • Onychognathus salvadorii
  • Onychognathus tenuirostris
  • Onychognathus tristramii
  • Onychognathus walleri
  • Onychogomphus assimilis
  • Onychogomphus macrodon
  • Onychomys arenicola (Mearns's Grasshopper Mouse)
  • Onychomys leucogaster (Northern Grasshopper Mouse)
  • Onychomys torridus (Southern Grasshopper Mouse, Tulare Grasshopper Mouse)
  • Onychomys torridus (Southern Grasshopper Mouse)
  • Onychorhynchus coronatus
  • Onychorhynchus occidentalis (Pacific Royal Flycatcher)
  • Onychorhynchus swainsoni (Atlantic Royal Flycatcher)
  • Onychostoma angustistomatus
  • Onychostoma brevis
  • Onychostoma daduensis
  • Onychostoma elongatum
  • Onychostoma fangi
  • Onychostoma fusiforme
  • Onychostoma gerlachi
  • Onychostoma laticeps
  • Onychostoma lepturus
  • Onychostoma lini
  • Onychostoma meridionale
  • Onychostoma rara
  • Onychylis nigrirostris (A Weevil)
  • Oodemas breviscapum (Nihoa Oodemas Weevil)
  • Oodemas erro (Wandering Oodemas Weevil)
  • Oodemas laysanensis (Laysan Oodemas Weevil)
  • Oodemas neckeri (Necker Oodemas Weevil)
  • Oodes amaroides (Ground Beetle)
  • Oodes americanus (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Oodes brevis (Ground Beetle)
  • Opaeophacus acrogeneius
  • Opalia montereyensis (Monterey Wentletrap)
  • Opanara altiapica
  • Opanara areaensis
  • Opanara bitridentata
  • Opanara caliculata
  • Opanara depasoapicata
  • Opanara duplicidentata
  • Opanara fosbergi
  • Opanara megomphala
  • Opanara perahuensis
  • Opeas nothapalinus
  • Opeatogenys cadenati
  • Opeatogenys gracilis
  • Opeia atascosa (A Grasshopper)
  • Opeia obscura (Obscure Grasshopper)
  • Opheodrys aestivus (Rough Green Snake)
  • Opheodrys herminae (Sakashima Green Snake)
  • Ophichthus altipennis (Highfin snake eel)
  • Ophichthus apachus (Thin Snake Eel)
  • Ophichthus aphotistos (Dark deepwater snake-eel)
  • Ophichthus apicalis (Bluntnose snake-eel)
  • Ophichthus arneutes
  • Ophichthus asakusae
  • Ophichthus bonaparti (Napoleon snake eel)
  • Ophichthus brachynotopterus
  • Ophichthus brasiliensis
  • Ophichthus brevicaudatus
  • Ophichthus celebicus
  • Ophichthus cephalozona (Dark-shouldered snake eel)
  • Ophichthus cruentifer (Margined Snake Eel)
  • Ophichthus cylindroideus (Dusky Snake Eel)
  • Ophichthus echeloides
  • Ophichthus episcopus
  • Ophichthus erabo (Fowler's snake eel)
  • Ophichthus evermanni
  • Ophichthus exourus
  • Ophichthus frontalis (Deathbanded Snake Eel)
  • Ophichthus garretti
  • Ophichthus genie
  • Ophichthus gomesi (Shrimp Eel)
  • Ophichthus gomesii (Shrimp Eel)
  • Ophichthus grandoculis
  • Ophichthus hyposagmatus (Faintsaddled Snake Eel)
  • Ophichthus karreri
  • Ophichthus kunaloa
  • Ophichthus leonensis
  • Ophichthus limkouensis
  • Ophichthus longipenis (Slender Snake Eel)
  • Ophichthus macrochir
  • Ophichthus macrops
  • Ophichthus maculatus
  • Ophichthus madagascariensis
  • Ophichthus manilensis
  • Ophichthus marginatus (Shorthead snake-eel)
  • Ophichthus mecopterus (Longarmed Snake Eel)
  • Ophichthus megalops
  • Ophichthus melanoporus (Blackpored Eel)
  • Ophichthus melope
  • Ophichthus menezesi
  • Ophichthus mystacinus
  • Ophichthus omorgmus (Dottedline Snake Eel)
  • Ophichthus ophis (Spotted Snake Eel)
  • Ophichthus parilis
  • Ophichthus polyophthalmus (Manyeyed Worm Eel, Ocellated Worm Eel)
  • Ophichthus puncticeps (Palespotted Eel)
  • Ophichthus regius (Regal Snake Eel)
  • Ophichthus remiger (Punctuated snake-eel)
  • Ophichthus rex (King Snake Eel)
  • Ophichthus roseus
  • Ophichthus rotundus
  • Ophichthus rufus (Rufus snake eel)
  • Ophichthus rugifer
  • Ophichthus rutidoderma
  • Ophichthus rutidodermatoides
  • Ophichthus serpentinus
  • Ophichthus singapurensis
  • Ophichthus spinicauda (Banded Snake Eel)
  • Ophichthus stenopterus
  • Ophichthus tchangi
  • Ophichthus tetratrema
  • Ophichthus triserialis (Pacific Snake Eel)
  • Ophichthus tsuchidae
  • Ophichthus unicolor (Plain snake-eel)
  • Ophichthus urolophus
  • Ophichthus woosuitingi
  • Ophichthus zophochir (Yellow Snake Eel)
  • Ophiclinops hutchinsi (Earspot snakeblenny)
  • Ophiclinops pardalis (Spotted snakeblenny)
  • Ophiclinops varius (Variegated snake-blenny)
  • Ophiclinus antarcticus (Adelaide snakeblenny)
  • Ophiclinus brevipinnis (Shortfin snakeblenny)
  • Ophiclinus gabrieli (Frosted snake-blenny)
  • Ophiclinus gracilis (Black-back snake-blenny)
  • Ophiclinus ningulus (Variable snake-blenny)
  • Ophiclinus pectoralis (Whiteblotch snakeblenny)
  • Ophidiocephalus taeniatus (Bronzeback Snake-lizard)
  • Ophidion asiro
  • Ophidion barbatum (Snake Blenny)
  • Ophidion beani (Longnose Cusk-eel)
  • Ophidion exul
  • Ophidion fulvum (Earspot cusk eel)
  • Ophidion galeoides (Striped cusk eel)
  • Ophidion genyopus
  • Ophidion grayi (Blotched Cusk-eel)
  • Ophidion holbrooki (Bank Cusk-eel)
  • Ophidion holbrookii (Band cusk-eel)
  • Ophidion imitator
  • Ophidion iris (Rainbow cusk eel)
  • Ophidion josephi
  • Ophidion lagochila (Hairlip Cusk)
  • Ophidion lozanoi
  • Ophidion marginatum (Striped Cusk-eel)
  • Ophidion metoecus
  • Ophidion muraenolepis
  • Ophidion nocomis (Letter opener)
  • Ophidion robinsi
  • Ophidion rochei
  • Ophidion rocheri
  • Ophidion saldanhai
  • Ophidion scrippsae (Basketweave Cusk-eel)
  • Ophidion selenops (Mooneye Cusk-eel)
  • Ophidion smithi
  • Ophidion welshi (Crested Cusk-eel)
  • Ophieleotris aporos (Snakehead Gudgeon)
  • Ophioblennius macclurei (Redlip Blenny)
  • Ophioblennius steindachneri (Large-banded blenny)
  • Ophioblennius trinitatis
  • Ophiocara macrolepidota
  • Ophiocara porocephala (Spangled Gudgeon)
  • Ophiodon elongatus (Lingcod)
  • Ophiogobius jenynsi
  • Ophiogobius ophicephalus
  • Ophiogomphus acuminatus (Acuminate Snaketail)
  • Ophiogomphus alleghaniensis (Allegheny Snaketail)
  • Ophiogomphus anomalus (Extra-striped Snaketail)
  • Ophiogomphus arizonicus (Arizona Snaketail)
  • Ophiogomphus aspersus (Brook Snaketail)
  • Ophiogomphus australis (Southern Snaketail)
  • Ophiogomphus bison (Bison Snaketail)
  • Ophiogomphus carolus (Riffle Snaketail)
  • Ophiogomphus cecilia (Grune Keiljungter)
  • Ophiogomphus colubrinus (Boreal Snaketail)
  • Ophiogomphus edmundo (Edmund's Snaketail)
  • Ophiogomphus howei (Pygmy Snaketail)
  • Ophiogomphus incurvatus (Appalachian Snaketail)
  • Ophiogomphus mainensis (Maine Snaketail)
  • Ophiogomphus morrisoni (Great Basin Snaketail)
  • Ophiogomphus occidentis (Sinuous Snaketail)
  • Ophiogomphus rupinsulensis (Rusty Snaketail)
  • Ophiogomphus severus (Pale Snaketail)
  • Ophiogomphus susbehcha (Wisconsin Snaketail)
  • Ophiogomphus westfalli (Westfall's Snaketail)
  • Ophiopteris papillosa (Flat-spined brittle star)
  • Ophioscion adustus (Croaker)
  • Ophioscion imiceps (Blinkard croaker)
  • Ophioscion obscurus
  • Ophioscion panamensis (Panama croaker)
  • Ophioscion punctatissimus (Spotted croaker)
  • Ophioscion scierus (Point-Tuza croaker)
  • Ophioscion simulus (Snub-nosed croaker)
  • Ophioscion strabo (Squint-eyed croaker)
  • Ophioscion typicus (Point-nosed croaker)
  • Ophioscion vermicularis (Vermiculated croaker)
  • Ophiothrix suensonii (Suenson's Brittle Star)
  • Ophisaurus attenuatus (Eastern Slender Glass Lizard)
  • Ophisaurus ceroni
  • Ophisaurus compressus (Island Glass Lizard)
  • Ophisaurus incomptus
  • Ophisaurus mimicus (Mimic Glass Lizard)
  • Ophisaurus ventralis (Eastern Glass Lizard)
  • Ophisoma prorigerum (Slope conger)
  • Ophisternon aenigmaticum (Swamp Eel)
  • Ophisternon afrum (Guinea Swamp Eel)
  • Ophisternon bengalense (Asian Swamp Eel, Bengal Swamp Eel, Ricefield Eel)
  • Ophisternon candidum (Blind Cave Eel)
  • Ophisternon gutturale (Australian Swamp Eel)
  • Ophisternon infernale (Blind Swamp Eel)
  • Ophisurus macrorhynchos
  • Ophisurus serpens (Sand Snake Eel, Serpent Eel)
  • Ophiura sarsi (Notched brittle star)
  • Ophryacus melanurus
  • Ophryacus undulatus
  • Ophryophryne gerti
  • Ophryophryne hansi
  • Ophryophryne microstoma
  • Ophryophryne pachyproctus
  • Ophrysia superciliosa (Himalayan Quail)
  • Ophthalmolepis lineolata (Maori wrasse)
  • Ophthalmolepis lineolatus (Maori)
  • Ophthalmolycus amberensis
  • Ophthalmolycus bothriocephalus
  • Ophthalmolycus campbellensis
  • Ophthalmolycus chilensis
  • Ophthalmolycus conorhynchus
  • Ophthalmolycus macrops
  • Ophthalmotilapia boops
  • Ophthalmotilapia heterodonta
  • Ophthalmotilapia nasuta
  • Ophthalmotilapia ventralis
  • Opisthocentrus ocellatus (Ocellated blenny)
  • Opisthocentrus tenuis
  • Opisthocentrus zonope
  • Opisthocomus hoazin
  • Opisthonema berlangai (Galapagos Thread Herring)
  • Opisthonema bulleri (Slender Thread Herring)
  • Opisthonema libertate (Deepbody Thread Herring)
  • Opisthonema medirastre (Middling Thread Herring)
  • Opisthonema oglinum (Atlantic Thread Herring)
  • Opisthopatus roseus (Pink Velvet Worm)
  • Opisthoproctus grimaldii (Barreleye)
  • Opisthoproctus soleatus (Barrel-eye)
  • Opisthoprora euryptera
  • Opisthopterus dovi (Dove's longfin herring)
  • Opisthopterus dovii (Dove's Longfin Herring)
  • Opisthopterus effulgens (Vaqueira Longfin Herring)
  • Opisthopterus equatorialis (Equatorial longfin herring)
  • Opisthopterus macrops (Bigeyed Longfin Herring)
  • Opisthopterus tardoore (Tardoore)
  • Opisthopterus valenciennesi (Slender Tardoor)
  • Opisthothylax immaculatus
  • Opisthotropis kikuzatoi (Kikuzato's Brook Snake)
  • Opisthotropis spenceri (Smith's Mountain Keelback)
  • Opistognathus aurifrons (Yellowhead Jawfish)
  • Opistognathus brasiliensis (Darkfin jawfish)
  • Opistognathus castelnaui
  • Opistognathus cuvierii (Bartail jawfish)
  • Opistognathus darwiniensis (Darwin jawfish)
  • Opistognathus decorus
  • Opistognathus dendriticus (Tabangka)
  • Opistognathus evermanni
  • Opistognathus eximius (Harlequin Smiler)
  • Opistognathus fenmutis
  • Opistognathus galapagensis (Galapagos jawfish)
  • Opistognathus gilberti (Yellow Jawfish, Yellow Jawfish)
  • Opistognathus hongkongiensis
  • Opistognathus hopkinsi
  • Opistognathus inornatus (Black jawfish)
  • Opistognathus iyonis
  • Opistognathus jacksoniensis (Smiler)
  • Opistognathus latitabundus (Blotched jawfish)
  • Opistognathus leprocarus (Roughcheek jawfish)
  • Opistognathus liturus
  • Opistognathus lonchurus (Moustache Jawfish)
  • Opistognathus macrognathus (Banded Jawfish, Longjaw Jawfish, Spotfin Jawfish)
  • Opistognathus macrolepis
  • Opistognathus margaretae (Halfscaled jawfish)
  • Opistognathus maxillosus (Mottled Jawfish)
  • Opistognathus megalepis
  • Opistognathus melachasme (Yellowmouth Jawfish)
  • Opistognathus mexicanus (Mexican jawfish)
  • Opistognathus muscatensis (Jawfish, Jawfish)
  • Opistognathus nigromarginatus (Bridled Jawfish, Moustached Jawfish, Moustached Jawfish)
  • Opistognathus nothus (Yellowmouth Jawfish)
  • Opistognathus panamaensis (Panamanian jawfish)
  • Opistognathus papuensis (Papuan jawfish)
  • Opistognathus punctatus (Finespotted jawfish)
  • Opistognathus reticulatus (Leopard jawfish)
  • Opistognathus rhomaleus (Giant jawfish)
  • Opistognathus robinsi (Spotfin jawfish)
  • Opistognathus rosenbergii
  • Opistognathus rosenblatti (Blue-spotted jawfish)
  • Opistognathus scops (Bullseye jawfish)
  • Opistognathus signatus
  • Opistognathus solorensis
  • Opistognathus whitehursti (Dusky Jawfish)
  • Oplegnathus conwayi (Cape Knifefish, Cape Knifefish)
  • Oplegnathus fasciatus (Striped Beakfish, Striped Beakfish)
  • Oplegnathus insignis (Pacific beakfish)
  • Oplegnathus peaolopesi (Mozambique Knifefish, Mozambique Knifefish)
  • Oplegnathus punctatus (Spotted Beakfish, Spotted Beakfish)
  • Oplegnathus robinsoni (Natal Knifefish, Natal Knifefish)
  • Oplegnathus woodwardi (Knifejaw)
  • Oplonaeschna armata (Riffle Darner)
  • Oplopomops diacanthus (Hole goby)
  • Oplopomus caninoides
  • Oplopomus oplopomus (Spinecheek Goby, Spinecheek Goby)
  • Opopsitta diophthalma
  • Opopsitta gulielmiterti
  • Oporornis agilis (Connecticut Warbler)
  • Oporornis formosus (Kentucky Warbler)
  • Oporornis philadelphia (Mourning Warbler)
  • Oporornis tolmiei (Macgillivray's Warbler)
  • Opostomias micripnus
  • Opostomias mitsuii (Pitgum lanternfish, Pitgum Lanternfish)
  • Opsanus beta (Gulf Toadfish)
  • Opsanus dichrostomus
  • Opsanus pardus (Leopard Toadfish)
  • Opsanus phobetron (Scarecrow Toadfish)
  • Opsanus tau (Oyster Toadfish)
  • Opsaridium boweni
  • Opsaridium christyi (Coppernose barb)
  • Opsaridium engrauloides
  • Opsaridium leleupi
  • Opsaridium loveridgii
  • Opsaridium maculicauda
  • Opsaridium microcephalum
  • Opsaridium microlepis (Lake salmon)
  • Opsaridium peringueyi (Southern barred minnow)
  • Opsaridium splendens
  • Opsaridium tweddleorum (dwarf sanjika)
  • Opsaridium ubangiense
  • Opsaridium zambezense (Barred minnow)
  • Opsariichthys bidens
  • Opsariichthys uncirostris (Three-lips)
  • Opsarius koratensis
  • Opsodoras boulengeri
  • Opsodoras morei
  • Opsodoras orthacanthus
  • Opsodoras stuebelii
  • Opsodoras ternetzi
  • Opsopoeodus emiliae (Pugnose Minnow)
  • Opsopoeodus emiliae (Pugnose minnow)
  • Opsopoeodus emiliae
  • Opthalmotilapia ventralis
  • Optioservus canus (Pinnacles Optioservus Riffle Beetle)
  • Optioservus fastiditus (A Riffle Beetle)
  • Optioservus ovalis (A Riffle Beetle)
  • Optioservus phaeus (Scott Optioservus Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optioservus trivittatus (A Riffle Beetle)
  • Optivus elongatus (Slender roughy)
  • Opua atherinoides
  • Opua elati
  • Orachrysops ariadne
  • Orachrysops niobe
  • Orangia cookei
  • Orangia maituatensis
  • Orangia sporadica
  • Oravelia pege (Dry Creek Cliff Strider Bug)
  • Oravelia pege (Dry Creek Cliff Strider Bug)
  • Orbonymus rameus (Splitfin Dragonet)
  • Orcaella brevirostris (Irrawaddy Dolphin)
  • Orchelimum bullatum (A Katydid)
  • Orchelimum campestre (Dusky-faced Meadow Katydid)
  • Orchelimum concinnum (Dusky-faced Meadow Grasshopper, Red-faced Meadow Katydid)
  • Orchelimum delicatum (Delicate Meadow Katydid)
  • Orchelimum gladiator (Gladiator Meadow Katydid)
  • Orchelimum nigripes (Red-legged Meadow Grasshopper, Black-legged Meadow Katydid)
  • Orchelimum silvaticum (A Meadow Katydid)
  • Orchelimum superbum (Superb Meadow Grasshopper, From Nc)
  • Orchelimum superbum (Superb Meadow Grasshopper, From Nc)
  • Orchelimum vulgare (Common Meadow Grasshopper, Common Meadow Katydid)
  • Orchesticus abeillei (Brown Tanager)
  • Orcinus orca (Killer Whale, Orca, Killer Whale, Melon-headed Whale)
  • Orconectes acares (A Crayfish)
  • Orconectes alabamensis (A Crayfish)
  • Orconectes australis (A Crayfish)
  • Orconectes barrenensis (A Crayfsih)
  • Orconectes bisectus (Crittenden Crayfish)
  • Orconectes blacki (A Crayfish)
  • Orconectes burri (A Crayfish)
  • Orconectes carolinensis (North Carolina Spiny Crayfish)
  • Orconectes causeyi (A Crayfish)
  • Orconectes chickasawae (A Crayfish)
  • Orconectes compressus (A Crayfish)
  • Orconectes cooperi (A Crayfish)
  • Orconectes cristavarius (A Crayfish)
  • Orconectes deanae (Conchas Crayfish)
  • Orconectes difficilis (Painted Crayfish)
  • Orconectes durelli (A Crayfish)
  • Orconectes erichsonianus (A Crayfish)
  • Orconectes etnieri (A Crayfish)
  • Orconectes eupunctus (Coldwater Crayfish)
  • Orconectes forceps (A Crayfish)
  • Orconectes harrisonii (Big River Crayfish)
  • Orconectes hartfieldi (A Crayfish)
  • Orconectes hathawayi (A Crayfish)
  • Orconectes hobbsi (A Crayfish)
  • Orconectes holti (A Crayfish)
  • Orconectes hylas (Woodland Crayfish)
  • Orconectes illinoiensis (A Crayfish)
  • Orconectes immunis (Calico Crayfish)
  • Orconectes incomptus (Tennessee Cave Crayfish)
  • Orconectes indianensis (A Crayfish)
  • Orconectes inermis (Troglobitic Crayfish)
  • Orconectes jeffersoni (Louisville Crayfish)
  • Orconectes jonesi (A Crayfish)
  • Orconectes kentuckiensis (A Crayfish)
  • Orconectes lancifer (A Crayfish)
  • Orconectes limosus (Spinycheek Crayfish)
  • Orconectes longidigitus (A Crayfish)
  • Orconectes luteus (A Crayfish)
  • Orconectes macrus (Neosho Midget Crayfish)
  • Orconectes maletae (A Crayfish)
  • Orconectes marchandi (Mammoth Spring Crayfish)
  • Orconectes margorectus (A Crayfish)
  • Orconectes medius (Saddlebacked Crayfish)
  • Orconectes meeki (A Crayfish)
  • Orconectes menae (A Crayfish)
  • Orconectes mirus (A Crayfish)
  • Orconectes mississippiensis (A Crayfish)
  • Orconectes nais (A Crayfish)
  • Orconectes nana (A Crayfish)
  • Orconectes neglectus (A Crayfish)
  • Orconectes obscurus (A Crayfish)
  • Orconectes ozarkae (A Crayfish)
  • Orconectes pagei (A Crayfish)
  • Orconectes palmeri (A Crayfish)
  • Orconectes pellucidus (Eyeless Crayfish)
  • Orconectes perfectus (A Crayfish)
  • Orconectes peruncus (Big Creek Crayfish)
  • Orconectes placidus (A Crayfish)
  • Orconectes propinquus (Northern Clearwater Crayfish)
  • Orconectes punctimanus (A Crayfish)
  • Orconectes putnami (A Crayfish)
  • Orconectes quadruncus (St. Francis River Crayfish)
  • Orconectes rafinesquei (A Crayfish)
  • Orconectes rhoadesi (A Crayfish)
  • Orconectes ronaldi (A Crayfish)
  • Orconectes rusticus (Rusty Crayfish)
  • Orconectes sanbornii (A Crayfish)
  • Orconectes saxatilis (Kiamichi Crayfish)
  • Orconectes sheltae (Shelta Cave Crayfish)
  • Orconectes shoupi (Nashville Crayfish)
  • Orconectes sloanii (A Crayfish)
  • Orconectes spinosus (A Crayfish)
  • Orconectes stannardi (A Crayfish)
  • Orconectes tricuspis (A Crayfish)
  • Orconectes validus (A Crayfish)
  • Orconectes virginiensis (Chowanoke Crayfish)
  • Orconectes virilis (Virile Crayfish)
  • Orconectes williamsi (A Crayfish)
  • Orconectes wrighti (A Crayfish)
  • Orcula austriaca
  • Orcula fuchsi
  • Orcula pseudodolium
  • Orcynopsis unicolor (Plain Bonito)
  • Ordtrachia australis
  • Ordtrachia elegans
  • Ordtrachia septentrionalis
  • Oreailurus jacobita (Andean Cat)
  • Oreamnos americanus (Mountain Goat)
  • Oreaster occidentalis (Gulf Star)
  • Orectoderus schuhi (A Plant Bug)
  • Orectoderus schuhi (A Plant Bug)
  • Orectolobus dasypogon (Tasselled wobbegong)
  • Orectolobus japonicus (Japanese Wobbegong)
  • Orectolobus maculatus (Spotted Wobbegong)
  • Orectolobus ornatus (Ornate Wobbegong)
  • Orectolobus wardi (Northern Wobbegong)
  • Oregonia gracilis (Graceful Decorator Crab)
  • Oregonichthys crameri (Oregon Chub)
  • Oregonichthys kalawatseti (Umpqua Chub, Umpqua Oregon Chub)
  • Oreias dabryi
  • Oreichthys cosuatis
  • Oreichthys parvus
  • Oreocharis arfaki
  • Oreochromis alcalica
  • Oreochromis alcalicus
  • Oreochromis amphimelas
  • Oreochromis andersonii (Three spotted tilapia)
  • Oreochromis angolensis
  • Oreochromis aureus (Blue Tilapia)
  • Oreochromis chungruruensis
  • Oreochromis esculentus (Singida tilapia)
  • Oreochromis grahami
  • Oreochromis hunteri
  • Oreochromis ismailiaensis
  • Oreochromis jipe
  • Oreochromis karomo (Karomo)
  • Oreochromis karongae
  • Oreochromis korogwe
  • Oreochromis latilabris
  • Oreochromis lepidurus
  • Oreochromis leucostictus
  • Oreochromis lidole
  • Oreochromis macrochir (Greenheaded Bream, Longfin Tilapia)
  • Oreochromis malagarasi
  • Oreochromis mortimeri (Kariba tilapia)
  • Oreochromis mossambicus (Mozambique Tilapia)
  • Oreochromis mweruensis
  • Oreochromis ndalalani
  • Oreochromis niloticus (Nile Mouthbreeder, Nile Tilapia)
  • Oreochromis niloticus
  • Oreochromis niloticus
  • Oreochromis niloticus (Tilapia)
  • Oreochromis niloticus
  • Oreochromis niloticus (Nile tilapia)
  • Oreochromis niloticus
  • Oreochromis niloticus
  • Oreochromis niloticus
  • Oreochromis pangani
  • Oreochromis pangani
  • Oreochromis pangani
  • Oreochromis placidus
  • Oreochromis placidus (Black tilapia)
  • Oreochromis placidus
  • Oreochromis rukwaensis (Lake Rukwa tilapia)
  • Oreochromis saka
  • Oreochromis salinicola
  • Oreochromis schwebischi
  • Oreochromis shiranus
  • Oreochromis shiranus (Chilwa tilapia)
  • Oreochromis shiranus
  • Oreochromis spilurus
  • Oreochromis spilurus (Athi River tilapia)
  • Oreochromis spilurus
  • Oreochromis spilurus (Sabaki tilapia)
  • Oreochromis squamipinnis
  • Oreochromis tanganicae
  • Oreochromis upembae
  • Oreochromis urolepis (Wami tilapia)
  • Oreochromis urolepis (Rufigi tilapia)
  • Oreochromis variabilis
  • Oreoglanis delacouri
  • Oreoglanis frenatus
  • Oreoglanis hypsiurus
  • Oreoglanis infulatus
  • Oreoglanis insignis
  • Oreoglanis lepturus
  • Oreoglanis macropterus
  • Oreoglanis setiger
  • Oreoglanis siamensis
  • Oreohelix idahoensis (Costate Mountainsnail)
  • Oreohelix jugalis (Boulder Pile Mountainsnail)
  • Oreohelix strigosa (Rocky Mountainsnail)
  • Oreohelix vortex (Whorled Mountainsnail)
  • Oreohelix waltoni (Lava Rock Mountainsnail)
  • Oreoica gutturalis
  • Oreokera cumulus
  • Oreokera nimbus
  • Oreolalax chuanbeiensis
  • Oreolalax granulosus
  • Oreolalax jingdongensisin
  • Oreolalax liangbeiensis
  • Oreolalax lichuanensis
  • Oreolalax major
  • Oreolalax multipunctatus
  • Oreolalax nanjiangensis
  • Oreolalax omeimontis
  • Oreolalax pingii
  • Oreolalax popei
  • Oreolalax puxiongensis
  • Oreolalax rhodostigmatus
  • Oreolalax rugosus
  • Oreolalax schmidti
  • Oreolalax weigoldi
  • Oreolalax xiangchengensis
  • Oreoleuciscus humilis (Dwarf Altai osman)
  • Oreoleuciscus potanini (Altai osman)
  • Oreomanes fraseri (Giant Conebill)
  • Oreomava cannfluviatilus
  • Oreomava otwayensis
  • Oreomystis bairdi (Kauai Creeper, Akikiki)
  • Oreomystis mana (Hawaii Creeper)
  • Oreonectes anophthalmus
  • Oreonectes furcocaudalis
  • Oreonectes platycephalus (Flat-headed loach)
  • Oreonectes retrodorsalis
  • Oreonympha nobilis
  • Oreophasis derbianus (Horned Guan)
  • Oreophilais robertsi
  • Oreopholus ruficollis
  • Oreophryne albopunctata
  • Oreophryne anthonyi
  • Oreophryne anulata
  • Oreophryne asplenicola
  • Oreophryne atrigularis
  • Oreophryne biroi
  • Oreophryne brachypus
  • Oreophryne brevicrus
  • Oreophryne celebensis
  • Oreophryne clamata
  • Oreophryne crucifer
  • Oreophryne flava
  • Oreophryne frontifasciata
  • Oreophryne geislerorum
  • Oreophryne hypsiops
  • Oreophryne idenburgensis
  • Oreophryne inornata
  • Oreophryne insulana
  • Oreophryne jeffersoniana
  • Oreophryne kampeni
  • Oreophryne kapisa
  • Oreophryne loriae
  • Oreophryne mertoni
  • Oreophryne minuta
  • Oreophryne moluccensis
  • Oreophryne monticola
  • Oreophryne nana (Camiguin Narrow-mouthed Frog)
  • Oreophryne notata
  • Oreophryne parkeri
  • Oreophryne pseudasplenicola
  • Oreophryne rookmaakeri
  • Oreophryne sibilans
  • Oreophryne unicolor
  • Oreophryne variabilis
  • Oreophryne waira
  • Oreophryne wapoga
  • Oreophryne wolterstorffi
  • Oreophryne zimmeri
  • Oreophrynella cryptica
  • Oreophrynella huberi
  • Oreophrynella macconnelli
  • Oreophrynella nigra
  • Oreophrynella quelchii
  • Oreophrynella vasquezi
  • Oreopsar bolivianus
  • Oreopsittacus arfaki
  • Oreornis chrysogenys
  • Oreortyx pictus (Mountain Quail)
  • Oreoscoptes montanus (Sage Thrasher)
  • Oreoscopus gutturalis (Fernwren)
  • Oreosoma atlanticum (Oreo)
  • Oreostruthus fuliginosus
  • Oreothraupis arremonops (Tanager Finch)
  • Oreotragus oreotragus (Klipspringer)
  • Oreotrochilus adela (Wedge-tailed Hillstar)
  • Oreotrochilus chimborazo
  • Oreotrochilus estella
  • Oreotrochilus leucopleurus
  • Oreotrochilus melanogaster
  • Orestias agassizii
  • Orestias albus
  • Orestias ascotanensis
  • Orestias chungarensis
  • Orestias crawfordi
  • Orestias ctenolepis
  • Orestias cuvieri (Orestias)
  • Orestias elegans
  • Orestias empyraeus
  • Orestias forgeti
  • Orestias frontosus
  • Orestias gilsoni
  • Orestias gracilis
  • Orestias gymnotus
  • Orestias hardini
  • Orestias imarpe
  • Orestias incae
  • Orestias ispi
  • Orestias jussiei
  • Orestias lastarriae
  • Orestias laucaensis
  • Orestias luteus
  • Orestias minimus
  • Orestias minutus
  • Orestias mooni
  • Orestias mulleri
  • Orestias multiporis
  • Orestias mundus
  • Orestias olivaceus
  • Orestias parinacotensis
  • Orestias pentlandiiand
  • Orestias polonorum
  • Orestias puni
  • Orestias richersoni
  • Orestias robustus
  • Orestias silustani
  • Orestias taquiri
  • Orestias tchernavini
  • Orestias tomcooni
  • Orestias tschudii
  • Orestias tutini
  • Orestias uruni
  • Orestias ututo
  • Oreta rosea (Whitemarked Tussock Moth)
  • Origma solitaria (Origma)
  • Orinocodoras eigenmanni
  • Oriolia bernieri (Bernier's Vanga)
  • Oriolus albiloris
  • Oriolus auratus
  • Oriolus bouroensis
  • Oriolus brachyrhynchus
  • Oriolus chinensis
  • Oriolus chlorocephalus
  • Oriolus crassirostris (Sao TomÉ Oriole)
  • Oriolus cruentus
  • Oriolus flavocinctus
  • Oriolus forsteni
  • Oriolus hosii (Black Oriole)
  • Oriolus isabellae (Isabela Oriole)
  • Oriolus larvatus
  • Oriolus melanotis
  • Oriolus mellianus (Silver Oriole)
  • Oriolus monacha
  • Oriolus nigripennis
  • Oriolus oriolus
  • Oriolus percivali
  • Oriolus phaeochromus
  • Oriolus sagittatus
  • Oriolus steerii
  • Oriolus szalayi
  • Oriolus tenuirostris
  • Oriolus traillii
  • Oriolus xanthonotus
  • Oriolus xanthornus
  • Oriturus superciliosus
  • Orlitia borneensis (Malaysian Giant Turtle)
  • Ormiscodes cinnamomea (Spiny Caterpillar)
  • Ornithion brunneicapillum
  • Ornithion inerme
  • Ornithion semiflavum
  • Ornithoptera aesacus
  • Ornithoptera alexandrae (Queen Alexandra's Birdwing)
  • Ornithoptera chimaera (Chimaera Birdwing)
  • Ornithoptera croesus
  • Ornithoptera meridionalis
  • Ornithoptera paradisea (Butterfly Of Paradise)
  • Ornithoptera rothschildi (Rothschild's Birdwing)
  • Ornithoptera tithonus
  • Ornithorhynchus anatinus (Duck-billed Platypus, Platypus)
  • Oroaetus isidori (Black-and-chestnut Eagle)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Orocharis saltator (Jumping Bush Cricket)
  • Oroperla barbara (A Stonefly)
  • Orphulella pelidna (Green Desert Grasshopper, Barrens Locust)
  • Orphulella speciosa (Pasture Locust)
  • Ortalis canicollis
  • Ortalis cinereiceps (Gray-headed Chacalaca)
  • Ortalis erythroptera (Rufous Headed Chachalaca)
  • Ortalis garrula
  • Ortalis guttata
  • Ortalis leucogastra
  • Ortalis motmot
  • Ortalis poliocephala
  • Ortalis ruficauda
  • Ortalis superciliaris
  • Ortalis vetula (Plain Chachalaca)
  • Ortalis wagleri
  • Orthalicus reses (Stock Island Treesnail)
  • Orthemis ferruginea (Roseate Skimmer)
  • Orthetrum poecilops
  • Orthetrum rubens (Waxy-winged Skimmer)
  • Orthochromis kalungwishiensis
  • Orthochromis kasuluensis
  • Orthochromis luichensis
  • Orthochromis luongoensis
  • Orthochromis machadoi (Cunene dwarf happy)
  • Orthochromis malagaraziensis
  • Orthochromis mazimeroensis
  • Orthochromis mosoensis
  • Orthochromis polyacanthus
  • Orthochromis rubrolabialis
  • Orthochromis rugufuensis
  • Orthochromis stormsi
  • Orthochromis torrenticola
  • Orthochromis uvinzae
  • Orthocis punctatus (A Minute Tree-fungus Beetle)
  • Orthocis punctatus (A Minute Tree-fungus Beetle)
  • Orthocis punctatus (A Minute Tree-fungus Beetle)
  • Orthocis punctatus (A Minute Tree-fungus Beetle)
  • Orthocis punctatus (A Minute Tree-fungus Beetle)
  • Orthocis punctatus (A Minute Tree-fungus Beetle)
  • Orthodon microlepidotus (Sacramento Blackfish)
  • Orthogalumna terebrantis (Waterhyacinth Mite)
  • Orthogeomys cavator (Chiriqui Pocket Gopher)
  • Orthogeomys cherriei (Cherrie's Pocket Gopher)
  • Orthogeomys cuniculus (Oaxacan Pocket Gopher)
  • Orthogeomys dariensis (Darien Pocket Gopher)
  • Orthogeomys grandis (Giant Pocket Gopher)
  • Orthogeomys heterodus (Variable Pocket Gopher)
  • Orthogeomys hispidus (Hispid Pocket Gopher)
  • Orthogeomys lanius (Big Pocket Gopher)
  • Orthogeomys matagalpae (Nicaraguan Pocket Gopher)
  • Orthogeomys thaeleri (Thaeler's Pocket Gopher)
  • Orthogeomys underwoodi (Underwood's Pocket Gopher)
  • Orthogonys chloricterus
  • Orthonama evansi
  • Orthonama obstipata (Gem)
  • Orthonopias triacis (Snubnose Sculpin)
  • Orthonyx spaldingii
  • Orthonyx temminckii
  • Orthopristis cantharinus (Sheephead grunt)
  • Orthopristis chalceus (Brassy grunt)
  • Orthopristis chrysoptera (Pigfish)
  • Orthopristis forbesi
  • Orthopristis lethopristis (Scalyfin grunt)
  • Orthopristis poeyi (Corocoro cubano)
  • Orthopristis reddingiin (Bronze-striped grunt)
  • Orthopristis ruber (Corocoro grunt)
  • Orthorhyncus cristatus (Antillean Crested Hummingbird)
  • Orthosia hibisci (Green Fruitworm, Speckled Green Fruitworm, A Moth)
  • Orthosia revicta (Rusty Whitesided Caterpillar, Subdued Quaker)
  • Orthospinus franciscensis
  • Orthosternarchus tamandua
  • Orthotomicus caelatus (A Weevil)
  • Orthotomicus caelatus (A Weevil)
  • Orthotomicus erosus (Mediterranean Pine Engraver Beetle)
  • Orthotomus atrogularis
  • Orthotomus castaneiceps
  • Orthotomus cinereiceps
  • Orthotomus cuculatus
  • Orthotomus derbianus
  • Orthotomus frontalis
  • Orthotomus heterolaemus
  • Orthotomus metopias
  • Orthotomus moreaui
  • Orthotomus nigriceps (Black-headed Tailorbird)
  • Orthotomus ruficeps
  • Orthotomus samarensis (Yellow-breasted Tailorbird)
  • Orthotomus sepium
  • Orthotomus sericeus
  • Orthotomus sutorius
  • Orthotrichia aegerfasciella (A Caddisfly)
  • Orthotrichia baldufi (A Caddisfly)
  • Orthotrichia cristata (A Caddisfly)
  • Orthotrichia curta (Short Orthotrichian Microcaddisfly)
  • Orthotrichia dentata (Dentate Orthotrichian Microcaddisfly)
  • Orthotrichia instabilis (Changeable Orthotrichian Microcaddisfly)
  • Orthrias angorae
  • Orthrias araxensis
  • Orthrias bergianus
  • Orthrias brandtii (Kura loach)
  • Orthrias euphraticus
  • Orthrias farsicus
  • Orthrias frenatus
  • Orthrias insignis
  • Orthrias kermanshahensis
  • Orthrias merga
  • Orthrias nudus
  • Orthrias panthera
  • Orthrias persus
  • Orthrias tigris
  • Orthrias tschaiyssuensis
  • Orthriopsis taeniura
  • Ortygospiza atricollis
  • Ortygospiza gabonensis
  • Ortygospiza locustella
  • Ortyxelos meiffrenii
  • Orycteropus afer
  • Oryctes rhinoceros (Coconut Rhinoceros Beetle)
  • Oryctolagus cuniculus (European Rabbit)
  • Oryx dammah (Scimitar-horned Oryx)
  • Oryx gazella (Gemsbok)
  • Oryx leucoryx (Arabian Oryx)
  • Oryzaephilus mercator (Merchant Grain Beetle, A Flat Bark Beetle)
  • Oryzaephilus surinamensis (Sawtoothed Grain Beetle, A Flat Bark Beetle)
  • Oryzaephilus surinamensis (Sawtoothed Grain Beetle, A Flat Bark Beetle)
  • Oryzaephilus surinamensis (Sawtoothed Grain Beetle, A Flat Bark Beetle)
  • Oryzaephilus surinamensis (Sawtoothed Grain Beetle, A Flat Bark Beetle)
  • Oryzaephilus surinamensis (Sawtoothed Grain Beetle, A Flat Bark Beetle)
  • Oryzaephilus surinamensis (Sawtoothed Grain Beetle, A Flat Bark Beetle)
  • Oryzias carnaticus
  • Oryzias celebensis (Celebes Medaka)
  • Oryzias curvinotus
  • Oryzias dancena
  • Oryzias haugiangensis
  • Oryzias hubbsi
  • Oryzias javanicus (Java Medaka, Javanese Ricefish)
  • Oryzias latipes (Japanese Killifish, Japanese Medaka, Ricefish)
  • Oryzias luzonensis
  • Oryzias marmoratus (Marmorated medaka)
  • Oryzias matanensis (Matano medaka)
  • Oryzias mekongensis
  • Oryzias minutillus (Dwarf medaka)
  • Oryzias nigrimas (Black buntingi)
  • Oryzias orthognathus (Sharpjawed buntingi)
  • Oryzias pectoralis
  • Oryzias profundicola (Yellow finned medaka)
  • Oryzias sinensis
  • Oryzias timorensis
  • Oryzias uwai
  • Oryzoborus angolensis
  • Oryzoborus atrirostris
  • Oryzoborus crassirostris (Large-billed Seed-finch)
  • Oryzoborus maximiliani (Great-billed Seed-finch)
  • Oryzoborus nuttingi
  • Oryzomys albigularis (Tomes's Rice Rat)
  • Oryzomys alfaroi (Alfaro's Rice Rat)
  • Oryzomys auriventer (Ecuadorean Rice Rat)
  • Oryzomys balneator (Peruvian Rice Rat)
  • Oryzomys bauri (Galapagos Rice Rat)
  • Oryzomys bolivaris (Bolivar Rice Rat)
  • Oryzomys buccinatus (Paraguayan Rice Rat)
  • Oryzomys capito (Large-headed Rice Rat)
  • Oryzomys chapmani (Chapman's Rice Rat)
  • Oryzomys couesi (Coues' Rice Rat, Coues's Rice Rat, Coues's Rice Rat, Coues' Rice Rat)
  • Oryzomys couesi (Coues's Rice Rat)
  • Oryzomys devius (Boquete Rice Rat)
  • Oryzomys dimidiatus (Thomas's Rice Rat)
  • Oryzomys galapagoensis (Galapagos Rice Rat)
  • Oryzomys gorgasi (Gorgas's Rice Rat)
  • Oryzomys hammondi (Hammond's Rice Rat)
  • Oryzomys intectus (Colombian Rice Rat)
  • Oryzomys intermedius (Intermediate Rice Rat)
  • Oryzomys keaysi (Keays's Rice Rat)
  • Oryzomys kelloggi (Kellogg's Rice Rat)
  • Oryzomys lamia (Monster Rice Rat)
  • Oryzomys legatus (Big-headed Rice Rat)
  • Oryzomys levipes (Light-footed Rice Rat)
  • Oryzomys macconnelli (Macconnell's Rice Rat)
  • Oryzomys megacephalus
  • Oryzomys melanotis (Black-eared Rice Rat)
  • Oryzomys nelsoni (Nelson's Rice Rat)
  • Oryzomys nitidus (Elegant Rice Rat)
  • Oryzomys oniscus (Sowbug Rice Rat)
  • Oryzomys palustris (Rice Rat, Silver Rice Rat)
  • Oryzomys polius (Gray Rice Rat)
  • Oryzomys ratticeps (Rat-headed Rice Rat)
  • Oryzomys rhabdops (Striped Rice Rat)
  • Oryzomys rostratus (Long-nosed Rice Rat)
  • Oryzomys saturatior (Cloud Forest Rice Rat)
  • Oryzomys subflavus (Terraced Rice Rat)
  • Oryzomys talamancae (Talamancan Rice Rat)
  • Oryzomys xantheolus (Yellowish Rice Rat)
  • Oryzomys yunganus (Yungas Rice Rat)
  • Oryzorictes hova (Hova Rice Tenrec)
  • Oryzorictes talpoides (Molelike Rice Tenrec)
  • Oryzorictes tetradactylus (Four-toed Rice Tenrec)
  • Osbornictis piscivora (Aquatic Genet)
  • Osgoodomys banderanus (Michoacan Deer Mouse)
  • Osmerus eperlanus (Smelt)
  • Osmerus mordax (Rainbow Smelt, Rainbow Smelt - Dwarf Form, Rainbow smelt - St. Lawrence southern estuary)
  • Osmerus mordax (Arctic rainbow smelt)
  • Osmerus mordax (Atlantic rainbow smelt)
  • Osmoderma eremita (Hermit Beetle)
  • Osobenus yakimae (A Stonefly)
  • Osopsaron formosensis
  • Osopsaron karlik
  • Osopsaron natalensis
  • Osopsaron verecundum
  • Osornophryne antisana
  • Osornophryne bufoniformis
  • Osornophryne guacamayo
  • Osornophryne percrassa
  • Osornophryne sumacoensis
  • Osornophryne talipes
  • Ospatulus palaemophagus
  • Ospatulus truncatulus
  • Ospatulus truncatus (Bitungu)
  • Osphronemus exodon (Elephant ear gourami)
  • Osphronemus goramy (Giant gourami)
  • Osphronemus laticlavius (Giant red tail gourami)
  • Osphronemus septemfasciatus
  • Ossubtus xinguense
  • Osteobrama alfrediana
  • Osteobrama bakeri
  • Osteobrama belangeri
  • Osteobrama bhimensis
  • Osteobrama cotio
  • Osteobrama cotio
  • Osteobrama cotio
  • Osteobrama dayi
  • Osteobrama feae
  • Osteobrama neilli
  • Osteobrama vigorsii
  • Osteocephalus buckleyi
  • Osteocephalus cabrerai
  • Osteocephalus deridens
  • Osteocephalus elkejungingerae
  • Osteocephalus exophthalmus
  • Osteocephalus fuscifacies
  • Osteocephalus heyeri
  • Osteocephalus langsdorffii
  • Osteocephalus leoniae
  • Osteocephalus leprieurii
  • Osteocephalus mutabor
  • Osteocephalus oophagus
  • Osteocephalus pearsoni
  • Osteocephalus planiceps
  • Osteocephalus subtilis
  • Osteocephalus taurinus
  • Osteocephalus verruciger
  • Osteocephalus yasuni
  • Osteochilichthys brevidorsalis (Kantaka barb)
  • Osteochilus bellus
  • Osteochilus borneensis
  • Osteochilus brachynotopteroides
  • Osteochilus chini
  • Osteochilus enneaporus
  • Osteochilus godavariensis (Chandkas barb)
  • Osteochilus harrisoni
  • Osteochilus hasseltii (Silver sharkminnow)
  • Osteochilus ingeri
  • Osteochilus intermedius
  • Osteochilus jeruk
  • Osteochilus kahajanensis
  • Osteochilus kappenii
  • Osteochilus kelabau
  • Osteochilus kuekenthali
  • Osteochilus lini
  • Osteochilus longidorsalis
  • Osteochilus melanopleurus
  • Osteochilus microcephalus
  • Osteochilus nashii (Nash's barb)
  • Osteochilus partilineatus
  • Osteochilus pentalineatus
  • Osteochilus pleurotaenia
  • Osteochilus repang
  • Osteochilus salsburyi
  • Osteochilus sarawakensis
  • Osteochilus schlegelii
  • Osteochilus serokan
  • Osteochilus sondhii
  • Osteochilus spilurus
  • Osteochilus striatus
  • Osteochilus thomassi (Konti barb)
  • Osteochilus triporos
  • Osteochilus vittatus (Bonylip barb)
  • Osteochilus waandersii
  • Osteodiscus andriashevi
  • Osteodiscus cascadiae (Bigtail snailfish, Bigtail Snailfish)
  • Osteogeneiosus militaris (Soldier catfish)
  • Osteoglossum bicirrhosum (Arawana)
  • Osteoglossum ferreirai (Black Arawana, Black Arowana, Black Arowana, Black Aruana)
  • Osteolaemus tetraspis (Congo Dwarf Crocodile)
  • Osteopilus brunneus
  • Osteopilus crucialis
  • Osteopilus dominicensis
  • Osteopilus marianae
  • Osteopilus pulchrilineatus
  • Osteopilus septentrionalis (Cuban Treefrog)
  • Osteopilus vastus
  • Osteopilus wilderi
  • Ostichthys acanthorhinus
  • Ostichthys archiepiscopus (Longsnout soldier)
  • Ostichthys brachygnathus
  • Ostichthys delta
  • Ostichthys hypsipterygion
  • Ostichthys japonicus (Brocade perch)
  • Ostichthys kaianus (Deepwater soldier)
  • Ostichthys ovaloculus
  • Ostichthys sandix
  • Ostichthys sheni
  • Ostichthys trachypoma (Bigeye Soldierfish)
  • Ostodes brazieri
  • Ostracion cubicus (Yellow boxfish)
  • Ostracion cyanurus (Bluetail trunkfish)
  • Ostracion immaculatus
  • Ostracion meleagris (Pahu, Pahu)
  • Ostracion nasus (Lognosed Boxfish)
  • Ostracion pentacanthus (Spinybacked Cowfish)
  • Ostracion rhinorhynchos (Horn-nosed Boxfish)
  • Ostracion solorensis (Reticulate boxfish)
  • Ostracion trachys (Roughskin trunkfish)
  • Ostracion whitleyi (Whitley's box)
  • Ostracoberyx dorygenys
  • Ostracoberyx fowleri
  • Ostracoberyx paxtoni
  • Ostrea conchaphila (Olympia Oyster)
  • Ostrea equestris (Crested Oyster)
  • Ostrinia marginalis
  • Ostrinia nubilalis (European Corn Borer, A Moth)
  • Ostrinia obumbratalis (Smartweed Borer)
  • Ostrinia penitalis (Bent-lined Tan)
  • Ostrocerca albidipennis (A Stonefly)
  • Ostrocerca complexa (A Stonefly)
  • Ostrocerca dimicki (A Stonefly)
  • Ostrocerca foersteri (A Stonefly)
  • Ostrocerca prolongata (A Stonefly)
  • Ostrocerca truncata (A Stonefly)
  • Otaria flavescens
  • Othonocheirodus eigenmanni
  • Othos dentex (Harlequin fish)
  • Otidiphaps nobilis
  • Otiorhynchus ligustici (A Weevil)
  • Otiorhynchus ovatus (A Beetle)
  • Otiorhynchus raucus (A Weevil)
  • Otiorhynchus rugosostriatus (A Weevil)
  • Otiorhynchus singularis (A Weevil)
  • Otiorhynchus sulcatus (Black Vine Weevil, A Weevil)
  • Otiorhynchus sulcatus (Black Vine Weevil, A Weevil)
  • Otiorhynchus sulcatus (Black Vine Weevil, A Weevil)
  • Otis tarda (Great Bustard)
  • Otis tetrax
  • Otocinclus affinis (Dwarf Sucking Catfish, Dwarf Sucking Catfish)
  • Otocinclus bororo
  • Otocinclus caxarari
  • Otocinclus flexilis
  • Otocinclus gibbosus
  • Otocinclus hasemani
  • Otocinclus hoppei
  • Otocinclus huaorani
  • Otocinclus macrospilus
  • Otocinclus mariae
  • Otocinclus mura
  • Otocinclus tapirape
  • Otocinclus vestitus
  • Otocinclus vittatus
  • Otocinclus xakriaba
  • Otocolobus manul (Pallas' Cat, Pallas's Cat)
  • Otocyon megalotis (Bat-eared Fox, Big-eared Fox)
  • Otolemur crassicaudatus (Greater Galago)
  • Otolemur garnettii (Small-eared Galago)
  • Otolithes cuvieri (Lesser tigertooth croaker)
  • Otolithes ruber (Tiger-toothed croaker)
  • Otolithoides biauritus (Bronze croaker)
  • Otolithoides pama (Pama croaker)
  • Otomops formosus (Java Mastiff Bat)
  • Otomops johnstonei
  • Otomops martiensseni (Large-eared Free-tailed Bat)
  • Otomops papuensis (Big-eared Mastiff Bat)
  • Otomops secundus (Mantled Mastiff Bat)
  • Otomops wroughtoni (Wroughton's Free-tailed Bat)
  • Otomys anchietae (Angolan Vlei Rat)
  • Otomys angoniensis (Angoni Vlei Rat)
  • Otomys denti (Dent's Vlei Rat)
  • Otomys irroratus (Vlei Rat)
  • Otomys laminatus (Laminate Vlei Rat)
  • Otomys maximus (Large Vlei Rat)
  • Otomys occidentalisder (Western Vlei Rat)
  • Otomys saundersiae (Saunders's Vlei Rat)
  • Otomys sloggetti (Sloggett's Vlei Rat)
  • Otomys tropicalis (Tropical Vlei Rat)
  • Otomys typus (Typical Vlei Rat)
  • Otomys unisulcatus (Bush Vlei Rat)
  • Otonycteris hemprichii (Desert Long-eared Bat)
  • Otonyctomys hatti (Hatt's Vesper Rat)
  • Otopharynx argyrosoma
  • Otopharynx auromarginatus (Golden-margined hap)
  • Otopharynx brooksi
  • Otopharynx decorus
  • Otopharynx heterodon (Royal blue hap)
  • Otopharynx lithobates
  • Otopharynx ovatus
  • Otopharynx pachycheilus
  • Otopharynx selenurus
  • Otopharynx speciosus
  • Otopharynx tetraspilus
  • Otopharynx tetrastigma
  • Otopharynx walteri (Aristochromis deep)
  • Otophidium chickcharney (Ghost Cusk-eel)
  • Otophidium dormitator (Sleeper Cusk-eel)
  • Otophidium indefatigabile (Bighead cusk eel)
  • Otophidium omostigmum (Polka-dot Cusk-eel)
  • Otophryne pyburni
  • Otophryne robusta
  • Otophryne steyermarki
  • Otopteropus cartilagonodus (Luzon Fruit Bat)
  • Otothyris juquiae
  • Otothyris lophophanes
  • Otothyris rostrata
  • Otothyris travassosi
  • Ototylomys phyllotis (Big-eared Climbing Rat)
  • Otus albogularis
  • Otus angelinae (Javan Scops-owl)
  • Otus asio (Eastern Screech-owl)
  • Otus atricapillus
  • Otus bakkamoena
  • Otus balli (Andaman Scops-owl)
  • Otus barbarus (Bearded Screech-owl)
  • Otus brookii
  • Otus brucei
  • Otus capnodes (Anjouan Scops-owl)
  • Otus choliba
  • Otus clarkii
  • Otus colombianus (Colombian Screech-owl)
  • Otus elegans
  • Otus flammeolus (Flammulated Owl)
  • Otus fuliginosus (Palawan Scops-owl)
  • Otus gurneyi (Giant Scops Owl)
  • Otus hartlaubi (Sao Tome Scops-owl)
  • Otus icterorhynchus
  • Otus ingens
  • Otus insularis (Seychelles Owl)
  • Otus ireneae (Morden's Owlet, Sokoke)
  • Otus kennicottii (Western Screech-owl)
  • Otus koepckeae
  • Otus lawrencii
  • Otus leucotis
  • Otus longicornis (Luzon Scops-owl)
  • Otus magicus
  • Otus manadensis
  • Otus mantananensis
  • Otus marshalli
  • Otus megalotis
  • Otus mentawi
  • Otus mindorensis (Mindoro Scops-owl)
  • Otus mirus (Mindanao Scops-owl)
  • Otus nudipes (Puerto Rican Screech-owl)
  • Otus pauliani (Comoro Scops-owl)
  • Otus pembaensis (Pemba Scops-owl)
  • Otus podarginus
  • Otus roboratus
  • Otus rufescens
  • Otus rutilus (Anjouan Scops Owl)
  • Otus sagittatus (White-fronted Scops-owl)
  • Otus sanctaecatarinae
  • Otus scops
  • Otus silvicola (Lesser Sunda Scops-owl)
  • Otus spilocephalus
  • Otus sunia (Oriental Scops-owl)
  • Otus trichopsis (Whiskered Screech-owl)
  • Otus umbra
  • Otus vermiculatus
  • Otus watsonii
  • Ougapia spaldingi
  • Oulimnius latiusculus (A Riffle Beetle)
  • Oulimnius latiusculus (A Riffle Beetle)
  • Oulimnius latiusculus (A Riffle Beetle)
  • Oulimnius latiusculus (A Riffle Beetle)
  • Oulimnius latiusculus (A Riffle Beetle)
  • Ourebia ourebi (Oribi)
  • Ovibos moschatus (Muskox)
  • Ovis ammon (Argali)
  • Ovis aries (Mouflon, Sheep (feral), European Mouflon Sheep)
  • Ovis canadensis (Desert Bighorn Sheep, Dall's Sheep)
  • Ovis dalli (Dall Sheep, Dall's Sheep, Fannin's Sheep, Stone's Sheep, Dall's Sheep, Kenai Dall Sheep, Stone Sheep)
  • Ovis nivicola (Snow Sheep)
  • Ovis vignei (Urial)
  • Ovophis chaseni
  • Ovophis monticola
  • Ovophis okinavensis
  • Owstonia dorypterus
  • Owstonia grammodon
  • Owstonia maccullochi
  • Owstonia macrophthalmus
  • Owstonia nigromarginatus
  • Owstonia pectinifer
  • Owstonia simoterus
  • Owstonia tosaensis
  • Owstonia totomiensis
  • Owstonia weberi
  • Owstonia whiteheadi
  • Oxicesta geographica (Defoliator Moth)
  • Oxuderces dentatus
  • Oxuderces wirzi (Wirz's goby)
  • Oxybelis aeneus (Brown Vine Snake, Mexican Vine Snake)
  • Oxybelis fulgidus
  • Oxybrycon parvulus
  • Oxychaeta dicksoni (Dickson's Copper)
  • Oxycheilinus arenatus (Speckled maori wrasse)
  • Oxycheilinus bimaculatus (Ragged-tail Wrasse)
  • Oxycheilinus celebicus
  • Oxycheilinus digramma (Cheeklined wrasse)
  • Oxycheilinus digrammus
  • Oxycheilinus lineatus
  • Oxycheilinus mentalis (Mental wrasse)
  • Oxycheilinus nigromarginatus
  • Oxycheilinus orientalis (Oriental maori wrasse)
  • Oxycheilinus rhodochrous
  • Oxycheilinus unifasciatus (Ringtail Wrasse)
  • Oxychilus agostinhoi
  • Oxychilus amaltheae
  • Oxychilus basajauna
  • Oxychilus lineolatus
  • Oxycirrhites typus (Longnose hawkfish)
  • Oxyconger leptognathus (Shorttail Pike Conger)
  • Oxydactyla alpestris
  • Oxydactyla brevicrus
  • Oxydactyla coggeri
  • Oxydactyla crassa
  • Oxydactyla stenodactyla
  • Oxydoras kneri
  • Oxydoras niger (Ripsaw catfish)
  • Oxydoras sifontesi
  • Oxyeleotris altipinna
  • Oxyeleotris aruensis (Aru gudgeon)
  • Oxyeleotris caeca
  • Oxyeleotris fimbriata (Fimbriate gudgeon)
  • Oxyeleotris herwerdenii (Blackbanded gauvina)
  • Oxyeleotris heterodon (Sentani gudgeon)
  • Oxyeleotris lineolata (Sleepy cod)
  • Oxyeleotris marmorata (Marble goby)
  • Oxyeleotris mertoni
  • Oxyeleotris nullipora (Poreless gudgeon)
  • Oxyeleotris paucipora (Fewpored gudgeon)
  • Oxyeleotris selheimi
  • Oxyeleotris siamensis
  • Oxyeleotris stagnicola
  • Oxyeleotris urophthalmoides
  • Oxyeleotris urophthalmus
  • Oxyeleotris wisselensis (Paniai gudgeon)
  • Oxyepoecus bruchi
  • Oxyepoecus daguerrei
  • Oxyepoecus inquilina
  • Oxyethira abacatia (A Caddisfly)
  • Oxyethira aculea (A Caddisfly)
  • Oxyethira aeola (A Caddisfly)
  • Oxyethira allagashensis (A Caddisfly)
  • Oxyethira anabola (A Caddisfly)
  • Oxyethira araya (A Caddisfly)
  • Oxyethira arizona (A Caddisfly)
  • Oxyethira azteca (A Caddisfly)
  • Oxyethira coercens (An Oxyethiran Microcaddisfly)
  • Oxyethira dualis (A Caddisfly)
  • Oxyethira dunbartonensis (A Caddisfly)
  • Oxyethira elerobi (Elerob's Microcaddisfly)
  • Oxyethira florida (Florida Oxyethiran Micro Caddisfly)
  • Oxyethira forcipata (A Caddisfly)
  • Oxyethira glasa (A Caddisfly)
  • Oxyethira grisea (An Oxyethiran Microcaddisfly)
  • Oxyethira itascae (A Caddisfly)
  • Oxyethira janella (Little-entrance Oxyethiran Microcaddisfly)
  • Oxyethira kingi (King's Cream and Brown Mottled Microcaddisfly)
  • Oxyethira lumipollex (A Caddisfly)
  • Oxyethira lumosa (A Caddisfly)
  • Oxyethira maya (A Caddisfly)
  • Oxyethira michiganensis (A Caddisfly)
  • Oxyethira mirabilis (A Caddisfly)
  • Oxyethira novasota (Novasota Oxyethiran Microcaddisfly)
  • Oxyethira obtatus (A Caddisfly)
  • Oxyethira pallida (A Caddisfly)
  • Oxyethira parce (A Caddisfly)
  • Oxyethira roberti (A Caddisfly)
  • Oxyethira rossi (A Caddisfly)
  • Oxyethira savanniensis (A Caddisfly)
  • Oxyethira serrata (A Caddisfly)
  • Oxyethira setosa (Setose Cream and Brown Mottled Microcaddisfly)
  • Oxyethira sida (A Caddisfly)
  • Oxyethira sininsigne (A Caddisfly)
  • Oxyethira ulmeri (A Caddisfly)
  • Oxyethira verna (An Oxyethiran Microcaddisfly)
  • Oxyethira zeronia (An Oxyethiran Microcaddisfly)
  • Oxygaster anomalura
  • Oxygaster pointoni
  • Oxygastra curtisii (Orange-spotted Emerald)
  • Oxygymnocypris stewartii
  • Oxyjulis californica (Senorita)
  • Oxylabes madagascariensis
  • Oxylapia polli
  • Oxylebius pictus (Painted Greenling)
  • Oxyloma kanabense (Kanab Ambersnail)
  • Oxylophus jacobinus
  • Oxylophus levaillantii
  • Oxymetopon compressus
  • Oxymetopon cyanoctenosum (Blue-barred ribbon goby)
  • Oxymetopon filamentosum
  • Oxymetopon formosum
  • Oxymetopon typus
  • Oxymonacanthus halli (Red Sea longnose filefish)
  • Oxymonacanthus longirostris (Beaked Leatherjacket, Beaked Leatherjacket)
  • Oxymormyrus boulengeri
  • Oxymormyrus zanclirostris
  • Oxymycterus akodontius (Argentine Hocicudo)
  • Oxymycterus angularis (Angular Hocicudo)
  • Oxymycterus delator (Spy Hocicudo)
  • Oxymycterus hiska (Small Hocicudo)
  • Oxymycterus hispidus (Hispid Hocicudo)
  • Oxymycterus hucucha (Quechuan Hocicudo)
  • Oxymycterus iheringi (Ihering's Hocicudo)
  • Oxymycterus inca (Incan Hocicudo)
  • Oxymycterus nasutus (Long-nosed Hocicudo)
  • Oxymycterus paramensis (Paramo Hocicudo)
  • Oxymycterus roberti (Robert's Hocicudo)
  • Oxymycterus rufus (Red Hocicudo)
  • Oxynotus bruniensis (Prickley Dogfish)
  • Oxynotus caribbaeus (Caribbean Roughshark)
  • Oxynotus centrina (Angular Roughshark)
  • Oxynotus japonicus (Japanese roughshark)
  • Oxynotus paradoxus (Sailfin Roughshark)
  • Oxypogon guerinii
  • Oxyporhamphus convexus (Halfbeak)
  • Oxyporhamphus micropterus (Smallwing Flyingfish)
  • Oxyporhamphus micropterus (Bigwing halfbeak)
  • Oxyporhamphus micropterus (False halfbeak)
  • Oxyrhopus petola (Calico Snake)
  • Oxyrophus rhombifer
  • Oxyropsis acutirostra
  • Oxyropsis wrightiana
  • Oxyruncus cristatus
  • Oxytelus sculptus (A Rove Beetle)
  • Oxytelus sculptus (A Rove Beetle)
  • Oxytelus sculptus (A Rove Beetle)
  • Oxytelus sculptus (A Rove Beetle)
  • Oxyura australis
  • Oxyura dominica (Masked Duck)
  • Oxyura ferruginea
  • Oxyura jamaicensis (Ruddy Duck)
  • Oxyura leucocephala (White-headed Duck)
  • Oxyura maccoa
  • Oxyura vittata
  • Oxyurichthys amabalis
  • Oxyurichthys auchenolepis
  • Oxyurichthys cornutus
  • Oxyurichthys dasi
  • Oxyurichthys formosanus
  • Oxyurichthys guibei (Blackspot Arrowfin Goby)
  • Oxyurichthys heisei (Ribbon goby)
  • Oxyurichthys lemayi (Lace Goby, Lace Goby)
  • Oxyurichthys lonchotus
  • Oxyurichthys microlepis (Finescale Arrowfin Goby, Smallscaled Goby)
  • Oxyurichthys mindanensis
  • Oxyurichthys notonema
  • Oxyurichthys oculomirus (Banded Arrowfin Goby)
  • Oxyurichthys ophthalmonema (Lined Arrowfin Goby)
  • Oxyurichthys papuensis (Frogface Goby, Spangled Arrowfin Goby)
  • Oxyurichthys paulae (Jester goby)
  • Oxyurichthys petersenii
  • Oxyurichthys saru
  • Oxyurichthys stigmalophius (Spotfin Goby)
  • Oxyurichthys takagi
  • Oxyurichthys tentacularis (Redspot Arrowfin Goby, Tentacled Goby)
  • Oxyurichthys uronema
  • Oxyurichthys viridis
  • Oxyurichthys visayanus (Purple Arrowfin Goby)
  • Oxyzygonectes dovii (White-eye, Whiteyes)
  • Ozius verreauxi (Velvet-fingered Ozius)
  • Ozotoceros bezoarticus (Pampas Deer)
  • Last Revised: June 23, 2005

    Bufo alvarius (Colorado River Toad)
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