Bayesian tree inferred from the analysis of COI sequences. Numbers at nodes indicate Bayesian Posterior Probabilities (BPP). Only BPP ≫ 0.95 are indicated. Scale bar reflects expected changes per site. * designates haplotypes characterizing specimens of Polystomoides multifalx (Stunkard, 1924) that were, for some of them, collected from Pseudemys concinna (Le Conte), for the others, from P. floridana (Le Conte) (see Table 3 for more details).