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Deltatheridium (meaning triangle beast or delta beast) is an extinct species of . It lived in what is now Mongolia during the Upper Cretaceous, circa 80 million years ago. A study in 2022 strongly suggested that Deltatheridium was a marsupial, making it the earliest known member of this group.
It had a length of about . Its teeth indicate it was carnivore. One specimen of Archaeornithoides might attest to an attack by this mammal, the skull bearing tooth marks that match its teeth.Elżanowski, A. Wellnhoffer, P. (1993). "Skull of Archaeornithoides From the Upper Cretaceous of Mongolia". earth.geology.yale.edu/~ajs/1993/11.1993.08Elzanowski.pdf . American Journal of Science
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