Melanella callistemma 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 maximum recorded shell length is 5.7 mm, its diameter is 1.6 mmWelch J. J. (2010). "The “Island Rule” and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
(Original description) The shell is small, slender, white, and flat-sided. It has a blunt apex and about ten whorls. The suture is distinct and appressed. The sculpture consists of faint incremental lines and an occasional varicose stria. The base is rounded and imperforate. The aperture is subovate. The outer lip is thin, simple, and somewhat patulous, while the inner lip is short.
Distribution This species occurs in the Atlantic ocean off Florida, USA.
Habitat Minimum recorded depth is 538 m. Maximum recorded depth is 538 m.
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