Figure 4.

Hybrid Species Tree for the Massasauga Rattlesnakes. Hybrid species tree used to examine the evidence for hybridization between S. c. catenatus and S. c. tergeminus in the formation of putative hybrid populations of Sistrurus in Missouri.

Gerard et al. BMC Evolutionary Biology 2011 11:291   doi:10.1186/1471-2148-11-291
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