This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Lithoglyphus apertus shell. Drawing of apertural view of the shell of Lithoglyphus apertus de icon Kster Die Gattungen Paludina Hydrocaena und Valvata Systematisches ConchylienCabinet von Martini und Chemnitz Nurnberg Bauer und Raspe archive org page plate fig Cropped levels adjusted background retouched Heinrich Carl Kster