Pleurotoma (Hemipleurotoma) calvertensis Martin 1904 Sediliopsis calvertensis is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

The lower part is strongly convex, with rounded oblique ribs which are sometimes recurved at the upper end, and are usually crossed by about four faint, regular, impressed spiral lines and another stronger one above the suture.

The body whorl shows about fifteen distinct impressed spirals below the costated shoulder.

The lines of growth are strong, sweeping in broad curves around the notch which is on the shoulder.

[2] Fossils of this species were found in Miocene Strata of the Chesapeake Bay, Maryland, USA.