Tricolia diantha McLean, J.H., 1970 Eulithidium diantha is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails.

[1][2] The height of the shell varies between 1.7 mm and 2.1 mm.

This marine species occurs off the Galápagos Islands, off Cocos Island and off Costa Rica.

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