Zenostephanus

Zenostephanus is true ammonite genus from the lower part of the Upper Jurassic of eastern England and Scotland belonging to the ammonitid family, Perisphinctidae.^[1]

Zenostephanus Temporal range: U Jura
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Perisphinctidae
Genus:	†Zenostephanus Arkell& Callomon,(1963)

Zenostephanus is revised from Xenostephanus, a preoccupied name for a new genus of toxodont notoungulate from Argentina.^[2] The type is Aulacostephanus ranbyensis