Euchelus [SEP] parent taxon
Euchelus
Euchelus is a genus of sea snails, marine gastropod mollusks in the family Chilodontaidae (formerly in the family Trochidae, the top snails).
Description.
The umbilicate or imperforate shell has a globose-turbinate shape. It is umbilicate or imperforate. The whorls are rounded and with spirally granose revolving ribs. The aperture is subcircular. The outer lip is thickened, and crenulate within. The columella shows a central tooth or a notch at the base. The operculum has few whorls that are rapidly increasing.
Herpetopoma
Herpetopoma is a genus of sea snails, marine gastropod molluscs of the family Chilodontaidae.
In the past, this genus was often treated as a subgenus of "Euchelus". However, this genus may prove to be a composite taxon, given the diversity of the shell forms.
Description.
The shell has a turbinate-conic shape as in "Euchelus". The spire is elevated. The operculum is multispiral as in a typical "Trochus" and with more, less rapidly expanding whorls compared with