Crassispira rugitecta is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.

The axial sculpture consists of about (on the penultimate whorl 17) short oblique similar ribs, beginning at the shoulder and on the body whorl gradually becoming obsolete toward the siphonal canal, separated by subequal interspaces.

The spiral sculpture consists of in front of the suture a prominent blunt keel, in the anal fasciole two or three subequal cords.

In front of the shoulder (on the penultimate whorl four, on the last whorl twelve or more) there are flattish equal cords overrunning the ribs, separated by narrower grooves which toward the siphonal canal become gradually wider.

The aperture is rather narrow and smooth within, the enamel dark brown except where the pale band reaches the margin of the outer lip.