Table 4. Genetic distance matrix estimated from the concatenated dataset (cytb, cox1, rag1 and rho) using the p-distance method in MEGA.

Species	1.	2.	3.	4.	5.	6.	7.	8.
1. G. cobitis
2. G. paganellus	7.73
3. G. niger	10.20	10.08
4. Z. ophiocephalus	10.36	9.73	9.35
5. P. nigricans	9.91	10.44	11.84	10.89
6. P. bonelli	10.66	11.04	12.29	11.71	11.21
7. N. fluviatilis	9.40	9.86	10.98	11.06	6.20	10.86
8. N. melanostomus	9.61	9.94	11.67	11.07	6.05	11.24	5.75
9. P. kessleri	10.93	11.54	12.52	12.49	10.04	12.04	9.50	9.94