Fig. 1From: Phylogeography of freshwater planorbid snails reveals diversification patterns in Eurasian continental islandsMap of the sample-collection sites. Colours and bars indicate areas where the samples were collected. A paleogeographic map in the lower left box shows geological history of the Japanese archipelago [32]. A sea passage between the continent and archipelago appeared in the southern part of the Japan Sea at 1.7Â Ma, and the land bodies of the Japanese archipelago was separated completely from the continentBack to article page