Anthoceras
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| Anthoceras Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Endocerida |
| Family: | †Proterocameroceratidae |
| Genus: | †Anthoceras Teichert and Glenister 1954 |
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.
