Fig. 2

Inferred genetic structure for the eight Bathymodiolus sampling localities based on the 18 diagnostic SNP markers. The graph confirms the existence of two mussel species (B. azoricus in red, B. puteoserpentis in blue) that are interbreeding in an asymmetric way along the Mid-Atlantic Ridge, as shown by the presence of individuals (vertical lines) with mixed ancestry (q-values between 0.05 and 0.92). MG = Menez Gwen, LS = Lucky Strike, RB = Rainbow, BS = Broken Spur, SP = Snake Pit, IR = Irina, QS = Quest, SM = Semenov. Adapted from [28] with permission from ELSEVIER