Additional file 12.

Geographic distribution of previously known Caenorhabditis species used in this study. Map showing the geographic distribution of C. elegans and C. briggsae and second map showing the distribution of previously known gonochoristic Caenorhabditis species.

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Kiontke et al. BMC Evolutionary Biology 2011 11:339   doi:10.1186/1471-2148-11-339