-
Orthocycloceras is an
extinct genus of
actively mobile carnivorous cephalopods,
essentially a Nautiloid, that
lived in what
would be
Europe during the...
- †Kopaninoceras †Merocycloceras †Michelinoceras †Ogygoceras †Orthoceras †
Orthocycloceras †Oxfordoceras †Palorthoceras †Plagiostomoceras †Pleurorthoceras †Pojetoceras...
- †Ophioceras †Ophionautilus †Oratoceras †Ordosoceras †Ormoceras †Orthoceras †
Orthocycloceras †Orthonybyoceras †Osbornoceras †Ovoceras †Ovocerina †Oxfordoceras †Oxygonioceras...
