Physella parkeri (or Physa parkeri), a freshwater snail endemic to North America.

plural of broadshoulder physa

plural of Cayuse physa

Physella globosa (or Physa globosa), a freshwater snail endemic to the eastern United States.

Physella bottimeri (syn. Physa bottimeri), a freshwater snail endemic to the southern United States.

plural of grain physa

plural of hotwater physa

Physella hordacea (or Physa hordacea), a freshwater snail endemic to the northwestern United States.

Physella wrighti (or Physa wrighti), a freshwater snail endemic to a small number of hot springs in northern British Columbia, Canada.

Physella cubiensis (or Physa cubiensis), a freshwater snail endemic to South America.