Adams H. & A., 1854
External shell stout, rounded, but usually unable to accommodate the entire animal during defensive retraction; several whorls; operculum absent.
Cephalic shield with or without tentacular processes. Parapodia large or small, never meeting in the mid-dorsal line. Gill present in mantle cavity.
Three calcareous gizzard-plates; radula n .1.1.1.n (Cylichna ) or 1.1.1 (Roxania and Scaphander ).
Source: Thompson, 1988.
The following subtaxa of this family occur in the region:
Genus Cylichna
Cylichna cylindracea
Genus Roxania
Roxania utricula
Genus Scaphander
Scaphander lignarius