Prunum cassis is a species of sea snail, a marine gastropod mollusc in the family Marginellidae.
Distribution P. cassis can be found in Caribbean waters, ranging from western Florida to Cuba.Felder, Darryl L & Sylvia A. Earle. Gulf of Mexico Origin, Waters, and Biota: Biodiversity. Corpus Christi, TX: Texas A&M University-Corpus Christi Press, 2009. 659.
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