This species lives in the river basins of the south-western Iberian Peninsula. Live populations are distributed throughout the Guadiana, Mira and Sado river basins in Spain and Portugal. In Portugal it is known from Mira (TorgalRiver) and Sado basins. It occurs in several tributaries of the Guadiana river in Spain (Estena, Milagro, Bullaque, Guadalmez) and Portugal (Amoreiras, Azambuja, Barranco do Vidigao, Caia, Chança, Foupana, Limas, Lucefecit, Marmelar, Odeleite, S. Pedro, Terges e Cobres, Vascao). There is one population at the Ruidera lakes (Guadiana river, Spain).