Region:

Fossil: Upper Eocene

Valid: Yes

Type Designation: Kohn, 1992

Type: Representation of Lectotype

Type Repository: Brander (1766: pl. i, fig. 22.)

Type Locality: England

Subspecies:

• C. granulosus Barros e Cunha, 1933.
• C. tremletti Le Renard, 1994.