Phlyctiderma verrilli, Verrill's diplodon or inflated diplodon, is a species of bivalve mollusc in the family Ungulinidae. It can be found along the Atlantic coast of North America, ranging from Massachusetts to North CarolinaAbbott, 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 Gulf of Mexico. The shell diameter can reach .
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