Figure 4 in Species boundaries, geographic distribution and evolutionary history of the Western Palaearctic freshwater mussels Unio (Bivalvia: Unionidae)

Figure 4. Differing shell shapes of Unio foucauldianus. A, Loukos River. B, Oum Er Rbia River. C, Molouya River. D, Mda River. E, Martil River. F, Beth River (Sebou). G, Loukos River. Scale bar 2 cm.