Uncancylus is a genus of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod molluscs 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" 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. <www.iucnredlist.org>. Downloaded on 06 May 2014.
Uncancylus concentricus (d'Orbigny, 1835) Uncancylus crequi (Bavay, 1904) Uncancylus foncki (Philippi, 1866) Uncancylus patagonicus (Biese, 1948)
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