Didelphodon  Didelphodon (from ["is"] "opossum" plus "tooth") is a genus of stagodont metatherians from the Late Cretaceous of North America. Although perhaps little larger than a Virginia opossum, with a maximum skull length of and a weight of , "Didelphodon" was a large mammal by Mesozoic standards. The teeth have specialized bladelike cusps and carnassial notches, indicating that the animal was a predator; the jaws are short and massive and bear enormous, bulbous premolar teeth which appear to have been used for crushing. Analyses of a near-complete skull referred to "Didelphodon" show that it had an unusually high bite force quotient (i.e. bite force relative to body size) among Mesozoic mammals, suggesting a durophagous diet. However, its skull lacks the vaulted forehead of hyenas and other specialized bone-eating durophagous mammals, indicating that its diet was perhaps a mixture of hard foodstuffs (e.g. snails, bones) alongside small vertebrates and carrion; although omnivorous habits were suggested in the past, it appears that it was incapable of processing plant matter, rendering it more likely to be hypercarnivorous or durophagous. Some convergence with the carnassials of other predatory mammal groups has also been noted. Three species of "Didelphodon" are known: "D. vorax", "D. padanicus", and "D. coyi". The genus is known from the Hell Creek Formation of Montana and the Lance Formation of Wyoming, the Frenchman Formation of Saskatchewan, the Horseshoe Canyon Formation of Alberta, and the Scollard Formation of Alberta, where it is one of the most abundant mammals. It is found solely in late Maastrichtian deposits. "Didelphodon" is a stagodontid marsupial related to "Eodelphis" and "Pariadens". The genus appears to descend from the Campanian "Eodelphis", and in particular appears to be related to "Eodelphis cutleri". "Pariadens" appears to be more primitive than either "Eodelphis" or "Didelphodon", and is probably sister to their group. Didelphimorphia is an order that was named in 1872 by Gill.