''Marisa'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

freshwater snail Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs ...

s in the family

Ampullariidae Ampullariidae, commonly known as the apple snails, is a family of large freshwater snails, aquatic gastropod mollusks with a gill and an operculum. These snails simultaneously have a gill and a lung as functional respiratory structures, wh ...

, the apple snails.

Species

There are two species: * ''

Marisa cornuarietis ''Marisa cornuarietis'', common name the Colombian ramshorn apple snail, is a species of large freshwater snail with an operculum, an aquatic gastropod mollusc in the family Ampullariidae, the apple snail family. These snails are popular ...

'' (Linnaeus, 1758) * ''

Marisa planogyra ''Marisa planogyra'' is a species of freshwater snail in the Ampullariidae family. Distribution ''M. planogyra'' has been found in Brazil, Colombia, Argentina, Venezuela, and Trinidad and Tobago Trinidad and Tobago (, ), officially th ...

'' Pilsbry, 1933

Phylogeny

Based on analysis of mitochondrial 12S ribosomal RNA,

16S ribosomal RNA 16 S ribosomal RNA (or 16 S rRNA) is the RNA component of the 30S subunit of a prokaryotic ribosome (SSU rRNA). It binds to the Shine-Dalgarno sequence and provides most of the SSU structure. The genes coding for it are referred to as 16S rRNA ...

, and the cytochrome-c oxidase I (COI) gene, ''M. cornuarietis'' is a sister clade to ''M. planogyra'' and ''

Asolene spixii ''Asolene spixii'' is a species of freshwater snail, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails. The specific name ''spixii'' is in honour of German biologist Johann Baptist von Spix. Distribution Brazil, Arge ...

'', indicating that genus ''Marisa'' is not

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

.Rawlings, T. A., et al. (2007)
The identity, distribution, and impacts on non-native apple snails in the continental United States.
''

BMC Evolutionary Biology ''BMC Ecology and Evolution'' (since January 2021), previously ''BMC Evolutionary Biology'' (2001–2020), is a peer-reviewed open access scientific journal covering all fields of evolutionary biology, including phylogenetics and palaeontology. It ...

'' 7: 97 .

Species

Phylogeny

References

Further reading