Retilaskeya bicolorRetilaskeya 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.DescriptionThe maximum recorded shell length is 20 mm.HabitatThe minimum recorded depth for this species is 0 m and the maximum recorded depth is 65 m.