Phylogeography of a freshwater crustacean species complex reflects a long‐gone archipelago

Aim The Carpathian Mountains are an important European biodiversity hotspot and are characterized by a dynamic geological history. Their freshwater amphipod fauna is ubiquitous and diverse, consisting of micro‐endemic lineages that apparently reflect historical geological events. In this study, we propose that the complementary distribution of two widespread morphotypes belonging to the Gammarus balcanicus species complex reflects two...