Shell elongated, small, turriculated, with heterostrophic top whorl of "type B" (according to van Aartsen, 1987). Wide and well rounded aperture. Two convex whorls, fragile and semi-transparent, separated by marked suture. Sculpture consisting of numerous and thread-like axial ribs, slightly inclined to left, and very thin spirals. No teeth or folds are visible in the columella. A slight chink is present.
common size :
1.4 mm in length: the type material is constituted by larger shells (up to 3.75 mm in length).
The characteristic shape of the shell and the fine sculpture make the species easy to identify.
BIOLOGY / ECOLOGY
Pyramidellids are ectoparasites, mainly of sedentary polychaetes and molluscs.
the Mediterranean samples seem to indicate that this is a shallow-water species, while the type material was collected in 463 m depth.