Crassispira nigerrima, common name the jet-black pleurotoma, is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.
Description The length of the shell varies between 13 mm and 20 mm.
(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. The aperture is oblong. The siphonal canal is rather long and a little reflected.Conchologia iconica, or, Illustrations of the shells of molluscous animals; Reeve, Lovell, Brooks, Vincent, Reeve, Frederic, Sowerby, G. B.I (George Brettingham), Taylor, John Edward, Reeve Benham & Reeve, Savill, Edwards and Co., Spottiswoode & Co. Vincent Brooks, Day & Son; vol.1 (1843)
Distribution This marine species occurs from the Gulf of California to Ecuador.
References
External links W.H. Dall (1909), Report on the collection of shells from Peru; Proceedings of the United States National Museum, Vol. 37, pages 147–294, with Plates 20–28 MNHN: specimen Biolib.cz: Crassispira nigerrima