Genus Physa is a group of freshwater snails that belong to the family Physidae. The snails are commonly found in North America, Europe, Asia, and Africa. Although the term "genus physa" is extensively used in biology, there are also several synonyms that refer to these snails. Some of the most common synonyms include Planorbis physa, Aplexa physa, Physa contorta, and Physa gyrina. These synonyms describe the same group of snails that have a spiral-shaped or conical shell, and they usually feed on aquatic plants and algae. Learning these synonyms can help biology students and enthusiasts get a better understanding of the different species and varieties within the genus Physa.