Eutrephoceras

Eutrephoceras; Temporal range:
	Fossil in Cincinnati Museum of Natural History & Science
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Nautilida
Family:	Nautilidae
Genus:	†Eutrephoceras; Hyatt, 1894
Type species
	Nautilus dekayi; Morton 1834
Species
	See text

Eutrephoceras is an extinct genus of nautilus from the Late Jurassic to the Miocene (around 161 to 5 million years ago). They are characterized by a highly rounded involute shell with slightly sinuous suture patterns.