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Upper molars of two new genera and species of mammals (Falepetrus barwini and Bistius bondi) are described from rocks of Late Cretaceous age of Montana, Wyoming, and New Mexico. Although these teeth are evolutionarily advanced in being fully tribosphenic, they have combinations of characters that preclude identification of the animals that bore them as either marsupials or eutherians. A review of available dental features useful in classification of known, fully-tribosphenic mammals from the Late Cretaceous suggests the presence of four principal groups: (1) Marsupialia; (2) Eutheria; (3) “deltatheridians;” and (4) others. Groups “ 1 ” and “2” are recognized...

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