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Most phylogenetic systematists assume speciation results in dichotomously branching phylogenies. Hybridization that gives rise to a new Lineage can produce character homoplasy that might obscure a species' true history. We report the results of a restriction-enzyme analysis of mitochondrial DNA (mtDNA) variation in three tiger salamander subspecies (Ambystoma tigrinum mavortium, Ambystoma tigrinum...