Aspa marginataAspa marginata is a species of sea snail, a marine gastropod mollusk in the family Bursidae, the frog shells.DescriptionShells of Aspa marginata can reach a size of. These shells are quite thick, beige in color, with a smooth surface, a deep siphonal canal and a short spire.DistributionThis marine species occurs in Western Africa, Senegal and Canary Islands.Fossil recordsThis genus is known in the fossil records from the Miocene of Italy and France to the Quaternary of Namibia and Spain.Cultural aspectsThe fossilized shells have been valued by humans and Neanderthals.