Diodora arcuataDiodora arcuata, common name the arcuate limpet, is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.DescriptionThe size of the shell varies between 8 mm and 15 mm.DistributionDiodora arcuata is found in the western Atlantic Ocean., in the Gulf of Mexico, the Caribbean Sea and the Lesser Antilles.