Operculum, [25], [155], [278], [282], [283]

Ophichthys, [601]

Ophidiidae, [713], [651], [702], [704], [163], [361]

Ophidium, [713], [361];

air-bladder, [302]

Ophioblennius, [709]

Ophiocephalidae, [644], [637], [163], [293], [361];

distribution, [645]

Ophiocephalus, [645];

labyrinthiform organ, [293];