Hlawiceras

Hlawiceras is an extinct genus from a well known subclass of fossil cephalopods known informally as ammonites that lived during the Jurassic Period, which lasted from approximately 200 to 145 million years ago.

Hlawiceras Temporal range: Bajocian[1] PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Family:	Stephanoceratidae
Genus:	Hlawiceras [2]

Hlawiceras belongs to the family Stephanoceratidae, true ammonites, which is contained in the Stephanoceratoidea. It is probably synonymous with the better known Garantiana

Hlawiceras (Garantiana) has an evolute discoidal shell with a subcircular cross section and close spaced transverse ribbing.

References

1. 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.
2. "Paleobiology Database - Hlawiceras". Retrieved 2017-10-19.

• Classification of the Jurassic Ammonitina, D. T. Donovan and J. H. Calloman 1981, in The Ammonoidea, edited by M.R. House and J.R. Senior;