Ancylini

Ancylini is a tribe of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails and their allies. This tribe used to be treated as a family; the current taxonomic placement within Planorbidae is according to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005).

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 in situations where the limpet is unable to reach the surface for air, as is often the case.

Genera
Genera in the tribe Ancylini include:


 * Ancylus Müller, 1773 - type genus
 * Pseudancylus
 * Rhodocephala


 * Ferrissia Walker, 1903


 * Rhodacmea Walker, 1917


 * Sineancylus Gutiérrez Gregoric, 2014
 * Anisancylus Pilsbry & Vanatta, 1924
 * Burnupia Walker, 1912
 * Gundlachia Pfeiffer, 1849
 * Hebetancylus Pilsbry, 1914
 * Laevapex Walker, 1903
 * Stimulator
 * Uncancylus Pilsbry, 1913