Ectoparasit on some tube building polychaetes in the infralittoral. The shell is large, markedly conical, with a small protoconch, rather flat whorls and a prominent columellar tooth. Notice also the keel that is visible on the last whorl, in the continuation of the suture. Presence of an umbilical slit.

Protoconch of type A. The shell of this species differs from that of the northern umbilicaris Malm by the whorls, which are flat and not convex as in Malm’s species, and by this slight keel that runs around the periphery (detail on the right). It differs from the shell of unidentata Montagu by its less marked suture.