Anthocerasとは 意味・読み方・使い方

Anthoceras is a straight, annulated, proterocamerioceratid (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 half way to almost to the previous septum); connecting rings thick. Endocones are long and slightly asymmetric.