Ancylus Fluviatilis is a freshwater snail species commonly found in Europe. Synonyms for this species include A. lacustris, A. acutus, and A. balticus. The synonym A. lacustris is commonly used in Sweden, Finland, and Estonia, while A. acutus is used in Great Britain and A. balticus is used in Russia. These synonyms are used interchangeably to refer to this small, shell-bearing mollusk. Ancylus Fluviatilis can be found in a variety of freshwater habitats such as ponds, lakes, and slow-moving rivers. They serve as an important food source for many aquatic animals and play a crucial role in maintaining a healthy ecosystem.