Retilaskeya bicolor is a species of sea snail, a gastropod in the family Newtoniellidae, which is known from the Caribbean Sea and the Gulf of Mexico. It was described by C. B. Adams, in 1845.Retilaskeya bicolor at World Register of Marine Species.

Description The maximum recorded shell length is 20 mm.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. .

Habitat The minimum recorded depth for this species is 0 m and the maximum recorded depth is 65 m.

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