Figure 3 in Species boundaries, geographic distribution and evolutionary history of the Western Palaearctic freshwater mussels Unio (Bivalvia: Unionidae)

Figure 3. Differing shell shapes of Unio tumidus. A, Franconian Saale, a tributary of the Main River (Rhine), Germany. B, Fulda River (Weser), Germany. C, Okna River (Danube), Slovakia. D, Danube River, Slovakia. E, Ferma Lake (Rhine), Germany. F, Thames River, UK. G, Fulda River (Weser), Germany. H, Rhine River, Germany. I, Horloff River (Rhine), Germany. Scale bar 2 cm.