Large-mouthed Valve Snail Valvata macrostoma
The Large-mouthed Valve Snail is a species of minute freshwater snail. It has a shell with fine and sharp ribs and rapidly increasing whorls, the first whorls are flat and the last whorls descending, the umbilicus is wide usually 1/4-1/3 of the shell diameter. Image: public domain (iNaturalist).
Find out more: iNaturalist