English name: Giant pond snail

German name: Spitzschlammschnecke

Taxonomy 

Phylum: Mollusca

Class: Gastropoda

Subclass: Orthogastropoda

Order: Pulmonata

Family: Lymnaeidae

Genus:  Lymnaea

Species:  Lymnaea stagnalis

The Lymnaea stagnalis is the biggest German native freshwater Pulmonata. It prefers lentic water.