Amphinemertes

Body slender and almost cylindrical; minute; proboscis sheath extends entire length of body; proboscis very large, equal to diameter of body when everted; armature typical for family; intestinal caecum extends forward almost to brain; cerebral sense organs large, situated against anterior and ventral surfaces of brain; ocelli absent; hermaphroditic.

A single species belonging to this genus has been reported from the coast of Alaska.