Ancylidae are a taxonomic family of small, freshwater, air-breathing limpets. In other words they are aquatic pulmonate gastropod mollusks.

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.

Genera within the family Ancylidae

Subfamily Ancylinae

• Ancylus O. F. Müller, 1773
• Pseudancylus
• Rhodacmaea Walker, 1917
• Rhodocephala

Subfamily Ferrissiinae

• Ferrissia Walker, 1903

Subfamily ?

• Gundlachia Pfeiffer, 1849
• Hebetoncylus Pilsbry, 1914
• Laevapex Walker, 1903
• Rhodacme Walker, 1917

References

• Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
• Good images and info at