Crassispira nigerrima, common name the jet-black pleurotoma, is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.

(Original description) The jet-black shell is acuminately pyramidal.

The upper part of the whorls is flat and slightly knobbed near the suture.

The lower portion is finely striated transversely, ribbed longitudinally, the ribs curved and rather wide apart.

[2] This marine species occurs from the Gulf of California to Ecuador.