Maximum likelihood tree for mitogenomes of Chelodina species, rooted with Elseya flaviventralis. Numbers at nodes are bootstrap support values and posterior probabilities from a Bayesian tree of the same topology; asterisks represent maximum support under both approaches. The three subgenera are indicated by different colors; putative C. kurrichalpongo from the Ord River floodplain, flagged with question marks. For type material, scientific names are followed by abbreviations for the type status (HT – holotype, LT – lectotype, PT – paratype). For all samples, the GenBank/ENA accession numbers or sample codes are shown (see also File S1). For focus taxa of the present study, the geographic origin and, as far as possible, the collection year are given. Abbreviations: NT – Northern Territory, QLD – Queensland, WA – Western Australia. Western Australian turtles color-coded to highlight different taxa. Note that C. expansa and C. walloyarrina (subgenus Chelydera) are placed among species of the subgenus Chelodina sensu stricto.