See text Crassispira is a genus of small predatory sea snails with narrow, high-spired shells, marine gastropod mollusks in the family Pseudomelatomidae.

[2] They first appeared in the fossil record approximately 48.6 million years ago during the Eocene epoch, and still exist in the present day.

[3] The small blackish "Drillias" so common in Panamic waters, of which Pleurotoma bottae Valenciennes is the type, were brought under the name of Crassispira Swainson, 1840 by W.H.

The outer lip shows a slight sinus above and is thickened internally at the top and the bottom.

The base of outer lip bears a very shallow, broad sinus, or stromboid notch.

The sculpture consists of narrow axial ribs, between which the spiral threads or grooves.