Atlantica guerinianaAtlantica gueriniana is a species of small air-breathing land snail, a terrestrial gastropod mollusk presently in the family Gastrodontidae, but formerly in Discidae, the disk snails.DistributionThis species is endemic to List of non-marine [molluscs of Madeira|Madeira], Portugal.Shell descriptionThe shell of these snails is shaped like a discus, or a lens, with a noticeable "edge" around the periphery of the whorls.Conservation statusThis species is mentioned in annexes IV and IV of the Habitats Directive.