Map showing localities of examined specimens: S. tenellus, S. microlepis phenotype 1, and S. microlepis phenotype 2, shadowed areas showing ranges of S. tenellus (blue) and S. microlepis (yellow); 1 – Ričice Reservoir, 2 – Ričina River, Posušje, 3 – Lower Matica River, 4 – Krenica Lake, 5 – Vrgoračka Matica River system (Vrgoračko Polje, Polje Jezero), 6 – Baćina lakes.