Eulithidium thalassicola, common name the turtle grass pheasant shell, is a species of sea snail, a marine gastropod mollusc in the family Phasianellidae.

[1] The height of the shell varies between 2 mm and 7.1 mm.

This species occurs in the Gulf of Mexico, the Caribbean Sea and the Lesser Antilles; in the Western Atlantic Ocean from North Carolina to Brazil.

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