Phlyctiderma semiasperum , or the pimpled diplodon, is a species of bivalve mollusc in the family Ungulinidae. It can be found in Caribbean waters, ranging from southern Florida to the West Indies,Abbott, R.T. & Morris, P.A. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies. New York: Houghton Mifflin, 1995. 46. and in the Gulf of Mexico. The shell diameter can reach .
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