Involuticeras

Involuticeras Temporal range: Kimmeridgian[2] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Superfamily:	Perisphinctoidea
Family:	Perisphinctidae
Genus:	Involuticeras [1] Quenstedt, 1846

Involuticeras is a perisphinctoid ammonite belonging to the Aulacostephanininae from the Upper Jurassic of Europe and possibly Mexico. The shell is involute, moderately compressed, with a rounded and ribbed venter. The genus is similar in general form to Aulacostephanus and Epicephalites.

References

1. "Paleobiology Database - Involuticeras". Retrieved 2017-10-19.
2. Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2008-05-07. Retrieved 2017-10-18.

Treatise on Invertebrate Paleontology, Part L,(1957), Mesozoic Ammonoidea, p. L324.