Small worms having three distinct body-shapes: short and maggot-like, slender and torpedo-shaped, or with an anterior region appreciably broader than the posterior. There are relatively few segments, which are often bi- or triannulate. A deep ventral gutter often present. Epidermis is sometimes strongly rugose. Prostomium is conical, without antennae or palps. Mouth is a transverse slit at the level of the first chaetiger. Chaetae are all simple, hair-like bristles and parapodia are ill-developed, biramous, without aciculae. Tentacular, dorsal and ventral cirri absent. Gills are fingerlike or paddle-shaped. Pygidium with multiple cirri. Pharynx is eversible, unarmed.
Common on sandy beaches.
After: Fauchald and Rouse, 1997 and Hayward and Ryland, 1990.
The following taxa of this family occur in the region: