Marisa (gastropod)

Marisa is a genus of freshwater snails in the family Ampullariidae, the apple snails.

Species
There are two species:
 * Marisa cornuarietis (Linnaeus, 1758)
 * Marisa planogyra Pilsbry, 1933

Phylogeny
Based on analysis of mitochondrial 12S ribosomal RNA, 16S ribosomal RNA, and the cytochrome-c oxidase I (COI) gene, M. cornuarietis is a sister clade to M. planogyra and Asolene spixii, indicating that genus Marisa is not monophyletic.