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Dreissena rostriformis live specimen collected in the Saône River in 2016. (A) Ventral view showing the asymmetric shell shape and the position of the byssus; (B) lateral view, left valve, with no zebra lines pattern; (C) frontal view showing the diagnostic rounded shell edges; D: zoom on the hinge; E: a living specimen in the Saône River, with long siphon extended. Scale bar: 20 mm (D and E not to scale).
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