Laevapex

Laevapex 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.

Geographic distribution
The genus has a New World distribution. It is widespread throughout the eastern United States, occurring in lakes and slow-flowing rivers.

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.

Members of this genus are characterised by their smooth apex.

Species
Species within the genus Laevapex include:


 * Laevapex diaphanus Haldeman, 1841
 * Laevapex fuscus C. B. Adams, 1841
 * Laevapex peninsulae Pilsbry, 1903
 * Laevapex vazi Santos, 1989

Walther (2008) considers North American Laevapex monotypic, collectively synonymising L. diaphanus, L. peninsulae and unidentified Laevapex sp. with L. fuscus, the type species.