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

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

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

References

1. revised name for Xenostephanus
2. Zenostephanus new name

• Perisphinctidae in the Treatise on Invertebrate Paleontology, Part L, Mollusca 4.

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