These are marine heterobranch gastropod mollusks, or micromollusks, in the family Pyramidellidae.

[citation needed] Subfamily Odostomiinae has been classified as one of eleven recognised subfamilies of the very voluminous gastropod family Pyramidellidae (according to the taxonomy of Ponder & Lindberg 1997):[5] Odostomiinae, Turbonillinae, Chrysallidinae, Cingulininae, Cyclostremellinae, Sayellinae, Syrnolinae, Eulimellinae, Pyramidellinae, Odostomellinae and Tiberiinae.

The shell of these snails has a blunt, heterostrophic protoconch, which is often pointed sideways or wrapped up.

Instead their long proboscis is used to pierce the skin of its prey and suck up its fluids and soft tissues.

Between the head and the foot, a lobed process called the mentum ( = thin projection) is visible.