(2-3-0-0-0-0-0-0-0-0-0-0-0)
Syn. Caudofoveata
Ref. Amer. Fish. Soc., 1988 p 5,20
Vaught, 1989 p viii,1

Neither a foot nor muscle bands are present in members of this subclass. One pair of ctenidia, separate stomach and digestive gland are distinctive characteristics. Members of this subclass are dioecious.