Cryoturris apteraCryoturris aptera is an extinct species of sea snail, a marine gastropod mollusk in the family Mangeliidae.DescriptionThe length of the shell attains 11.4 mm, its diameter 3.9 mm.DistributionThis extinct marine species has been found in Pliocene strata of the Bowden Formation, Jamaica; age range: 3.6 to 2.588 Ma.