Public domain: Species accounts (62 / 1904)

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Species
Obelia dichotoma
Obesogammarus crassus
Ocenebra erinaceus
Ocinebrellus inornatus
Octactis octonaria
Octopus cyanea
Oculina patagonica
Odessia maeotica
Odetta zekiergeni
Odontella sinensis
Odontodactylus scyllarus
Odostomia lorioli
Ogyrides mjoebergi
Oithona brevicornis brevicornis
Oithona davisae
Oithona plumifera
Oithona setigera
Oithona similis
Okenia pellucida
Okenia picoensis
Omobranchus punctatus
Onchocleidus dispar
Oncorhynchus clarkii
Oncorhynchus gorbuscha
Oncorhynchus keta
Oncorhynchus kisutch
Oncorhynchus mykiss
Oncorhynchus nerka
Oncorhynchus tshawytscha
Onisimus sextoni
Ophiactis macrolepidota
Ophiactis savignyi
Ophioblennius atlanticus
Ophryotrocha diadema
Ophryotrocha japonica
Oplegnathus fasciatus
Orchestia cavimana
Orchestia gammarellus
Oreochromis niloticus niloticus
Oscilla galilae
Oscilla jocosa
Oscilla virginiae
Osmundea oederi
Ostorhinchus fasciatus
Ostracion cubicum
Ostracoblabe implexa
Ostrea angasi
Ostrea denselamellosa
Ostrea equestris
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
Oxyurichthys petersii