Table 5.

Mitochondrial genetic divergence for the main geographic groups observed within flat periwinkles, after removing potential introgressed individuals

Group	1- fNE1	2- fNE2	3- fIP	4- oN	5- oIP
1- fNE1	0.0012	0.0069	0.0081	0.0129	0.0177
2- fNE2	0.0050	0.0026	0.0072	0.0121	0.0166
3- fIP	0.0066	0.0050	0.0018	0.0130	0.0181
4- oN	0.0095	0.0080	0.0093	0.0056	0.0171
5- oIP	0.0158	0.0141	0.0160	0.0131	0.0025

Divergence within each group is indicated in the diagonal in bold; Dxy, above the diagonal; Da below diagonal. fNE1 – L. fabalis from northern Europe, fNE2 – L. fabalis from central Europe, fIP – L. fabalis from Iberian Peninsula. oN – L. obtusata from North America and from northern-central Europe, oIP – L. obtusata from Iberian Peninsula. Geographic groups were defined according to Fig. 4