Astiericeras

Astiericeras; Temporal range: Albian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Superfamily:	Ancylocerataceae (?)
Family:	Douvilleiceratidae
Subfamily:	Douvilleiceratinae
Genus:	Astiericeras; Parona & Bonarelli. 1896
Species
	see text;

Astiericeras is an ammonite from the Lower Cretaceous, the shell of which is evolute, stout; outer whorl with strong, well spaced, transverse ribs that cross smoothly over the broad venter; early whorls with lateral tubercles. The outer, mature whorl separates from the coil but hooks back quickly, referred to as a heteromorph.

Astiericeras is generally considered to be a douvillieceratid.^[2] However, according to W. J. Kennedy, the genus may instead be a scaphitoid.^[3]

References

^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
^ Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
^ Kennedy, W. J. (1985). "Observations on Astiericeras astierianum (d'Orbigny, 1842) (Cretaceous Ammonoidea)". Geological Magazine. 123 (5): 507–513. doi:10.1017/S0016756800035093.

This ammonite-related article is a stub. You can help Wikipedia by expanding it.

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

[Arkell1957-2] Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.

[Kennedy1986-3] Kennedy, W. J. (1985). "Observations on Astiericeras astierianum (d'Orbigny, 1842) (Cretaceous Ammonoidea)". Geological Magazine. 123 (5): 507–513. doi:10.1017/S0016756800035093.

[1]

[2]

[3]