Anthoceras Explained

Anthoceras is a genus of straight, annulated, proterocamerioceratid molluscs (Order Endocerida) from the Lower Ordovician, found in North America, North-Western 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.

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

See also

• Mutvei. Harry. Siphuncular structure in Ordovician endocerid cephalopods. Acta Palaeontologica Polonica. 1997. 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. 10.1080/03115518308619626. 1983Alch....7..155C . 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. Early Ordovician cephalopod fauna from northwestern Australia. Bulletins of American Paleontology. 1954. 35. 150. 7–112.