Anthoceras

Anthoceras is a genus of straight, annulated, proterocamerioceratids (Order Endocerida) from the Lower Ordovician, found in North America, NW Australia, and Siberia. The cross section is circular, the siphuncle moderately large, and marginal. Segments are constricted (producing concave profiles in internal molds); septal necks hemichoantici to subholochoantic (reaching halfway to almost to the previous septum); connecting rings thick. Endocones are long and slightly asymmetric.

Anthoceras Temporal range: Early Ordovician–Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Endocerida
Family:	Proterocameroceratidae
Genus:	Anthoceras Teichert and Glenister 1954

This genus is based on the phragmocone, the chambered part of the shell; the apical and apetural ends are unknown.

See also

• Mutvei, Harry (1997). "Siphuncular structure in Ordovician endocerid cephalopods". Acta Palaeontologica Polonica. 42 (3): 375–390.
• Crick, Rex E.; Teichert, Curt (January 1983). "Ordovician endocerid genus Anthoceras: its occurrence and morphology". Alcheringa: An Australasian Journal of Palaeontology. 7 (2): 155–162. doi:10.1080/03115518308619626. ISSN 0311-5518.

References

• Curt Teichert, 1964. Endoceratoidea. Treatise on Invertebrate Paleontology, Part K. Geol Soc. of America and Univ of Kansas press. Teichert and Moore (eds)
• Teichert; Glenister (1954). "Early Ordovician cephalopod fauna from northwestern Australia". Bulletins of American Paleontology. 35 (150): 7–112.