Phlyctiderma semiasperum , or the pimpled diplodon,[2][3] is a species of bivalve mollusc in the family Ungulinidae.

[1][4] It can be found in Caribbean waters, ranging from southern Florida to the West Indies,[2] and in the Gulf of Mexico.

[1] The shell diameter can reach 1.3 cm (0.51 in).

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