Fissurella vernaFissurella verna is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.DescriptionThe size of the shell varies between 20 mm and 51 mm.DistributionThis marine species occurs in the Atlantic Ocean off the Cape Verdes. It is considered part of the endemic fissurellid fauna of the islands.