Phylogeny of the marsupials. Phylogenetic relationships of the orders of Marsupialia. Top: the placement of the contemporary continents of South America and Australia within Gondwanaland and the split of the American and Australian marsupials. Relative divergence in millions of years shown to the left in the context of geological periods. The relationship of the Macropodide within the Australian marsupial phylogeny shown is in purple with estimated divergence dates in millions of years [5, 162, 163]. Representative species from each clade are illustrated. Inset: phylogeny of the genus Macropus within the Macropodidae showing the placement of the model species M. eugenii (purple) based on . Outgroup species are Thylogale thetis and Petrogale xanthopus.