Maximum clade probability tree displayed as a chronogram and paleogeography around the Japanese Archipelago. (A) Divergence times calculated in BEAST based on fossil records (outgroups not shown). Japanese pomatiopsid taxa are indicated by asterisks. Horizontal bars in the tree give the 95% credible interval for the age of each node. Numbers above and below branches represent mean node ages and posterior probabilities, respectively. (B, C) Hypothesized paleodistribution of clades I and II. Paleogeographic maps of East Asia were modified from Iijima & Tada . Shaded areas indicate land. (B) Early Miocene (23-18 Ma), divergence of two clades. (C) Middle to late Pliocene (3.5-2 Ma), ongoing diversification and range expansion within each clade.
Kameda and Kato BMC Evolutionary Biology 2011 11:118 doi:10.1186/1471-2148-11-118