Marisa (gastropod)Marisa is a genus of freshwater snails in the family Ampullariidae, the apple snails.SpeciesThere are two species:Marisa cornuarietis Marisa planogyra Pilsbry, 1933PhylogenyBased on analysis of mitochondrial 12S ribosomal RNA, 16S ribosomal RNA, and the cytochrome-c oxidase I gene, M. cornuarietis is a sister clade to M. planogyra and Asolene spixii, indicating that genus Marisa is not monophyletic.