Phylogenetic analysis of mitochondrial DNA sequences. Maximum Likelihood tree (ln = –8860.2974) obtained in the analysis of 186 cytochrome b gene sequences of Ctenomys. Numbers indicate bootstrap (right of the diagonal) and posterior probability (left of the diagonal, found in a Bayesian analysis) values of adjacent nodes; a missing value indicates that the given node has less than 50% of posterior probability. Terminal labels indicate species name and GenBank accession numbers.