''Uncancylus'' is a genus of small,

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include ...

, air-breathing

limpet Limpets are a group of aquatic snails that exhibit a conical shell shape (patelliform) and a strong, muscular foot. Limpets are members of the class Gastropoda, but are polyphyletic, meaning the various groups called "limpets" descended indep ...

s, aquatic

pulmonate Pulmonata or pulmonates, is an informal group (previously an order, and before that a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group includ ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusc Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...

s in the family Planorbidae, the ram's horn snails and their allies.

Anatomy

These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "

pseudobranch The pseudobranch, also pseudobranchia is the reduced first gill arch of a fish (on the inner surface of the opercle, near the junction of the preopercle) as well as a reduced "false" gill in some gastropods. In teleost fish, the pseudobranchs are m ...

" which can serve perfectly well as a gill when they are unable to reach the surface for air.

Species

Species within the genus ''Uncancylus'' include:IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2

Downloaded on 06 May 2014. * ''

Uncancylus concentricus ''Uncancylus concentricus'' is a species of small, freshwater, air-breathing limpet, an aquatic pulmonate gastropod mollusc in the family Planorbidae, the ram's horn snails and their allies. Distribution ''U. concentricus'' occurs in Costa Ri ...

'' (d'Orbigny, 1835) * '' Uncancylus crequi'' (Bavay, 1904) * '' Uncancylus foncki'' (Philippi, 1866) * '' Uncancylus patagonicus '' (Biese, 1948)

References

Planorbidae {{Planorbidae-stub