Eodelphis

Eodelphis, from eo- plus []"delphis", thus meaning "very early opossum", is a genus of stagodont metatherians from the Late Cretaceous of North America, with distinctive crushing dentition. Named species include "E. browni" and the more advanced "E. cutleri". Both come from the Late Campanian (Judithian "Land Mammal Age") of Dinosaur Provincial Park, Alberta. Specimens are also known from the Judith River Formation of Montana. "E. cutleri" is related to the Maastrichtian genus "Didelphodon" as indicated by its enlarged premolars and more robust jaw. "Eodelphis" was probably an aquatic predator like its relative "Didelphodon", and may have weighed about 0.6 kg (1.3 lb), making it one of the largest mammals of its time.