Coroniceras is a genus in the Arietitidae, a family in the ammonitid

Ammonitida

The Ammonitida is an order of more highly evolved ammonoid cephalopods from the Jurassic and Cretaceous time periods, commonly with intricate ammonitic sutures....

 superfamily Psiloceratiaceae, from the lower Sinermurian stage in the Lower Jurassic. It is a sub zone ammonite of the Armioceras semicostotum Zone

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

Lyme Regis

Lyme Regis is a coastal town in West Dorset, England, situated 25 miles west of Dorchester and east of Exeter. The town lies in Lyme Bay, on the English Channel coast at the Dorset-Devon border...

, Dorset Coast

Dorset Coast

Dorset Coast may refer to:* MSTS: Dorset Coast - Route for MSTS1* Dorset - The county in the UK...

, England in the higher limestones of the Blue Lias

Lias

Lias may refer to:*In geology:**The Lias Group, a group in the stratigraphy of Great Britain, formed during the Late Triassic to Early Jurassic epochs. It includes the Blue Lias and White Lias...

.

Species

Coroniceras bucklandi

Coroniceras charlesi

Coroniceras rotiforme

Coroniceras validanfractum