Location of the study area with sampling sites. A Geographic position of Morocco. B Map of Morocco with different basins assigned with numbers following the national division of the basins; 1: Loukkos Basin, 2: Moulouya Basin; 3: Sebou Basin, 4: Bouregreg Basin, 5: Oum Er Rabia Basin, 6: Tensift Basin, 7: Drâa-Ziz-Rhériss Basin, 8: Souss-Massa Basin, 9: Sakia El Hamra- Oued Eddahab. C -F Distribution maps of all five species (M. lacustre and P. amnicum occur in the same locality) across the country with their respective bibliographic records (marked with rhombi) (coordinates are given in Suppl. material