Temporal range: Late Cretaceous - Paleocene, 75–56Ma
Nyssodon Simpson, 1927
They were once considered to be marsupials, but now are considered to be members of the order Cimolesta (which was named after the genus). The cimolestids may be the common ancestral group of two clades of carnivorous mammals: Carnivora and the extinct Creodonta.
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