Public domain: Species accounts (63 / 1910)

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Species Synonym
Obelia dichotoma Obelia australis
Obesogammarus crassus  
Ocenebra erinaceus European sting winkle
Ocinebrellus inornata  
Ocinebrellus inornatus Ocenebra inornata
Ocinebrellus inornatus
Octactis octonaria  
Octopus cyanea  
Oculina patagonica  
Odessia maeotica  
Odetta zekiergeni  
Odontella sinensis Biddulphia sinensis Greville, 1866 (basionym)
Odontodactylus scyllarus  
Odostomia lorioli  
Ogyrides mjoebergi  
Oithona brevicornis brevicornis  
Oithona davisae  
Oithona plumifera  
Oithona setigera  
Oithona similis  
Okenia pellucida  
Okenia picoensis  
Omobranchus punctatus Blennechis punctatus Valenciennes, 1836
Omobranchus dasson (non Jordan & Snyder, 1902)
Omobranchus japonicus (Bleeker, 1869)
Omobranchus japonicus scalatus Smith, 1959
Omobranchus lineolatus (Kner, 1868)
Petrocirtes kochi Weber, 1907
Petroscirtes japonicus Bleeker, 1869
Petroscirtes kochi Weber, 1907
Petroscirtes lineolatus Kner, 1868
Petroskirtes japonicus Bleeker, 1869
Onchocleidus dispar Haplocleidus dispar (Müller 1936)
Oncorhynchus clarkii  
Oncorhynchus gorbuscha  
Oncorhynchus keta  
Oncorhynchus kisutch  
Oncorhynchus mykiss Fario gairdneri (Richardson, 1836)
Oncorhynchus gairdnerii (Richardson, 1836)
Oncorhynchus kamloops (Jordan, 1892)
Oncorhynchus mykiss nelsoni (Evermann, 1908)
Parasalmo mykiss (Walbaum, 1792)
Oncorhynchus nerka  
Oncorhynchus tshawytscha Oncorhynchus chouicha (Jordan & Gilbert, 1883)
Oncorhynchus cooperi (Suckley, 1861)
Salmo cooperi (Suckley, 1861)
Onisimus sextoni  
Ophiactis macrolepidota  
Ophiactis savignyi  
Ophioblennius atlanticus  
Ophryotrocha diadema  
Ophryotrocha japonica  
Oplegnathus fasciatus Scaradon fasciatus
Orchestia cavimana  
Orchestia gammarellus Orchestia gammarella
Oreochromis niloticus  
Oscilla galilae  
Oscilla jocosa  
Oscilla virginiae  
Osmundea oederi  
Ostorhinchus fasciatus  
Ostracion cubicum  
Ostracoblabe implexa  
Ostrea angasi  
Ostrea denselamellosa  
Ostrea equestris Ostrea stentina Payraudeau, 1826
Ostrea puelchana  
Ostrea stentina  
Ostreid herpesvirus 1  
Ostreopsis ovata  
Ostreopsis siamensis  
Owenia borealis  
Oxydromus humesi  
Oxyphysis oxytoxoides  
Oxytoxum criophilum  
Oxytoxum gladiolus  
Oxytoxum variabile  
Oxyurichthys papuensis Apocryptes petersii Klunzinger, 1871
Gobius belosso Bleeker, 1854
Gobius papuensis Valenciennes, 1837
Oxyurichthys petersi (Klunzinger, 1871)
Oxyurichthys petersii