''Atokatheridium'' is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

genus of

Deltatheridiidae Deltatheridiidae is an extinct family of basal carnivorous metatherians that lived in the Cretaceous and were closely related to marsupials. Their fossils are restricted to Central Asia ( Mongolia and Uzbekistan) and North America ( United S ...

from Cretaceous of United States.Z. Kielan-Jaworowska and R. L. Cifelli. 2001. Primitive boreosphenidan mammal (?Deltatheroida) from the Early Cretaceous of Oklahoma. Acta Palaeontologica Polonica 46(3):377-391.

References

Prehistoric metatherians Cretaceous mammals of North America Fossils of the United States Fossil taxa described in 2001 Prehistoric mammal genera {{cretaceous-mammal-stub