Margarita eythrocoma Dall, 1889 Pseudostomatella erythrocoma is a species of very small sea snail, a marine gastropod mollusk or micromollusk in the family Trochidae, the top snails.

[2] This species occurs in the Gulf of Mexico, the Caribbean Sea and off the Lesser Antilles.

Its color is yellowish, variegated and articulated with rose-pink and opaque white.

The radiating sculpture of the lines of growth is occasionally irregular so as to form faint waves, but usually inconspicuous.

The spiral sculpture consists of fine close little-raised threads, with on the upper surface one and on the periphery another stronger thread or carination, seldom nodulous, and stronger on the earlier whorls.