Fig. 2

Molecular phylogenetic analysis of amphibian mitochondrial genomes and genes. The phylogenetic tree is drawn to scale, with branch lengths measured in the number of substitutions per site. The analysis involved a complete mitochondrial (Mt) genome sequences of salamanders, toads and frogs, classified as Rana (blue highlight) or Lithobates (yellow highlight). Analysis of Mt genes b cyb, c rnr1, and d rnr2 of selected frog species. Position of R. catesbeiana indicated by an asterisk