Map of major dispersal patterns of Chinese population of P. nigromaculata identified in this study. Points show the sampling locations in Fig. 1. Solid arrows indicate dispersal pattern of lineage A. Dotted arrows indicate patterns of dispersal of lineage B. Arrows with star "*" indicate that the pattern is not confirmed. Gray arrows from Chinese eastern coast to Japanese archipelago indicate the dispersal pattern via past land bridge. The symbol "?" indicates that the origin of the population has not been resolved. Gray areas represent past glacial refugia.
Zhang et al. BMC Evolutionary Biology 2008 8:21 doi:10.1186/1471-2148-8-21