Operculum, [25], [155], [278], [282], [283]
Ophichthys, [601]
Ophidiidae, [713], [651], [702], [704], [163], [361]
air-bladder, [302]
Ophioblennius, [709]
Ophiocephalidae, [644], [637], [163], [293], [361];
distribution, [645]
Ophiocephalus, [645];
labyrinthiform organ, [293];