Genus Ancylus refers to a group of small freshwater snails that are found in various parts of the world. These snails are characterized by their flattened, spiral shells and are commonly known as "pond snails." They are an important part of aquatic ecosystems as they play a vital role in nutrient cycling and provide food for other organisms such as fish and birds. Synonyms for Genus Ancylus include Ancylidae, Planorbidae, Planorbinae, and Helisomidae. These synonyms are used by scientists to classify different species of pond snails, based on their physical and genetic characteristics. Despite their small size and unassuming appearance, these snails play a significant role in maintaining the health of freshwater environments.