Deltatheridium (meaning triangle beast or delta beast) is an extinct species of metatherian. It lived in what is now Mongolia during the Upper Cretaceous, circa 80 million years ago.[1] It was a basal metatherian, which places it near start of the linage that led to the marsupials, such the kangaroo, koala, and opossum.

It had a length of 15 cm (5.9 in). Its teeth indicate it was carnivorous.




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