Acroloxidae

Acroloxidae, commonly known as river limpets, are a taxonomic family of very small, freshwater snails, aquatic pulmonate gastropod limpet-like mollusks with a simple flattened conical shell in the clade Hygrophila.

Acroloxidae is the only family within the superfamily Acroloxoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

Distribution
Worldwide.

Anatomy
Pulmones are reduced. Sexual cavity and accessory gills are on the right side.

Genera
Genera within the family Acroloxidae include:
 * Acroloxus Beck, 1838 - type genus
 * Baicalancylus Starobogatov, 1967
 * Frolikhiancylus Sitnikova & Starobogatov, 1993
 * Gerstfeldtiancylus Starobogatov, 1989
 * Pseudancylastrum Lindholm, 1909


 * Synonyms:
 * Costovelletia Starobogatov, 1991 : synonym of Acroloxus H. Beck, 1838 (a junior synonym)
 * Dinarancylus Starobogatov, 1991 : synonym of Acroloxus H. Beck, 1838 (a junior synonym)
 * Velletia J. E. Gray, 1840 : synonym of Acroloxus H. Beck, 1838 (junior objective synonym)