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A new study that suggests all living marsupials originated in South America and share a common ancestor has been disputed by an Australian palaeontologist as "simplistic".
In a paper published today in the open-access journal PLoS Biology , Dr Maria Nilsson and colleagues from the University of Muenster in Germany use a genetic marker known as retroposons to trace the lineage of marsupials.
But, Professor Mike Archer, of the University of New South Wales, says the work is simplistic and ignores already published data.