Fig. 1

Map of the Iberian Peninsula showing major river drainages and distribution of barbel species. Color lines delimit the distribution ranges of each species. Collection sites: 1 – Tâmega; 2 – Zêzere; 3 – Ocreza; 4 – Erges; 5 – Xarrama; 6 – Caia; 7 – Guadiana; 8 – Ardila; 9 – Chança; 10 – Vascão; 11 – Foupana; 12 – Segura; 13 – Bullent; 14 – Cabriel; 15 – Mijares; 16 – Mesa; 17 – Alhama (see also Table 1)