Physidae

species of mollusc

thumb|225px|Physa marmorata in France.thumb|225px|Physella heterostropha halei of the Central and Southern USA, about 1 cm long.thumb|right|The sinistral shell of Physella acuta

species of mollusc

Physa is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the subfamily Physinae of the family Physidae.

species of mollusc

Aplexa is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae.

species of mollusc

species of mollusc

species of mollusc

species of mollusc

Physella is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae.

species of mollusc

species of mollusc

species of mollusc

species of mollusc