clade Hypsogastropoda clade Littorinimorpha | superfamilia = Calyptraeoidea | familia = Calyptraeidae | genus = Crepidula | genus_authority = Lamarck, 1799 | synonyms_ref = | synonyms = Crepidula, common name the `slipper limpets` or `slipper shells`, is a genus of sea snails, marine gastropod mollusks in the family Calyptraeidae. This family ...