The river limpet is a freshwater snail belonging to the family Ancylidae. This freshwater snail has several other synonyms such as the freshwater limpet, pond limpet, and the file shell. The river limpet is a small, cone-shaped snail that lives in rivers, streams, and ponds. The file shell is so-called due to the ridges on its shell which look like file teeth. Its small size and ability to adhere to rocks make it an excellent indicator species for environmental changes. The pond limpet is nocturnal and feeds on algae and detritus. These synonyms for the river limpet highlight their extraordinary characteristics and importance in freshwater ecosystems.