Coroniceras

Coroniceras is a genus in the Arietitidae, a family in the ammonitid superfamily Psiloceratoidea, from the lower Sinermurian stage in the Lower Jurassic. It is a sub zone ammonite of the Arnioceras semicostatum Zone.

Coroniceras Temporal range: Early Jurassic, Sinemurian[1] PreꞒ Ꞓ O S D C P T J K Pg N
Coroniceras rotiforme
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Arietitidae
Subfamily:	†Arietitinae
Genus:	†Coroniceras Hyatt, 1867
Species[2]
C. bucklandi C. charlesi C. rotiforme C. validanfractum
Synonyms
Arnioceratoides Spath, 1922 Epammonites Spath, 1922 Pararnioceras Primarietites Buckman, 1926 Saccaiaceras Nannarone, 2002 Venturi Nannarone, 2002

Coroniceras has a thin discoidal form with a circular whorl section, arched venter, single tall keel, and few but strong ribs. Coroniceras is included in the subfamily Arietitinae.

Fossils of Coroniceras bucklandi are commonly found at Lyme Regis, Dorset Coast, England in the higher limestones of the Blue Lias.^[3]