Xipheroceras

Xipheroceras is a Lower Jurassic ammonite belonging to the Eoderoceratidae, and sometimes placed in the subfamily Xipheroceratinae for which it is the namesake. It has been found in the upper Sinemurian (about mid L Jurassic) of Europe and possibly Borneo.

Xipheroceras Temporal range: Sinemurian[1] PreꞒ Ꞓ O S D C P T J K Pg N
Xipheroceras ziphus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Superfamily:	Eoderoceratoidea
Family:	Eoderoceratidae
Genus:	Xipheroceras Buckman, 1911

Xipheroceras, named by Buckman, 1911, has an evolute shell, all whorls clearly exposed, only very slightly impressed dorsally (on the inside curvature). Inner and middle whorls have strong ribs with large spines at the outer ends. Outer whorls have closer simpler ribs.

References

1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.

• Arkell, et al., 1957. Mesozoic Ammonoidea, in Treatise on Invertebrate Paleontology, (Part L); Geological Soc. of America and University of Kansas press.
• Donovan, D.T. Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association.