Melanella penna is a species of sea snail, a marine gastropod mollusk in the family Eulimidae. The species is one of many species known to exist within the genus, Melanella.
Description The lengt of the shell attains 5.7 mm, its diameter 2 mm.
(Original description) The small shell is conical, smooth, polished, and creamy white. It has a blunt apex and eight flattened whorls. The suture is obscure, appressed, and lightly overglazed. The surface is devoid of sculpture. The aperture is semilunate, with a simple and somewhat flexuous outer lip. The body whorl bears a layer of enamel, while the inner lip is slightly concave and has a perceptible umbilical depression behind it. The base is evenly rounded.
Distribution This species occurs in the Atlantic Ocean off Florida, USA.
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