Pleurotoma nigrescens C.B.Adams, 1845 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Gastropoda order Neogastropoda family Pseudomelatomidae genus Crassispira species Crassispira nigrescens Name Homonyms Pleurotoma nigrescens Reeve, 1845 Pleurotoma nigrescens C.B.Adams, 1845