Crepidula atrasolea is a species of small sea snail, a slipper snail, a marine gastropod mollusk in the family Calyptraeidae, the slipper snails or slipper limpets, cup-and-saucer snails, and hat snails. This species is similar to C. plana and C. depressa but can be distinguished from them on the basis of dark pigment on the foot, direct developing embryos. DNA sequence data shows that these three species are closely related within the genus Crepidula but are not closely related to other flat white species of Crepidula which occur distributed throughout the phylogeny of Crepidula.