Public domain: List of registered species (63 / 2024)

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Species
Obelia dichotoma
Obesogammarus crassus
Oblimopa multistriata
Ocenebra erinaceus
Ocinebrellus inornatus
Octactis octonaria
Octopus cyanea
Oculina oculina patagonica
Oculina patagonica
Odessia maeotica
Odontella sinensis
Odontodactylus scyllarus
Odostomia lorioli
Ogyrides mjoebergi
Oithona brevicornis brevicornis
Oithona davisae
Oithona plumifera
Oithona setigera
Oithona similis
Olindias singularis
Omobranchus punctatus
Onchocleidus dispar
Oncorhynchus clarkii
Oncorhynchus gorbuscha
Oncorhynchus keta
Oncorhynchus kisutch
Oncorhynchus mykiss
Oncorhynchus nerka
Oncorhynchus tshawytscha
Onisimus sextoni
Onuphis eremita oculata
Ophiactis macrolepidota
Ophiactis savignyi
Ophioblennius atlanticus
Ophiocoma scolopendrina
Ophryotrocha diadema
Ophryotrocha japonica
Oplegnathus fasciatus
Orchestia cavimana
Orchestia gammarellus
Oreochromis mossambicus
Oreochromis niloticus niloticus
Oryzias sinensis
Oscilla galilae
Oscilla jocosa
Osmundea oederi
Ostracoblabe implexa
Ostrea angasi
Ostrea denselamellosa
Ostrea equestris
Ostrea puelchana
Ostrea stentina
Ostreid herpesvirus 1
Ostreopsis ovata
Ostreopsis siamensis
Owenia borealis
Oxydromus humesi
Oxynoe viridis
Oxyphysis oxytoxoides
Oxytoxum criophilum
Oxytoxum gladiolus
Oxytoxum variabile
Oxyurichthys papuensis