Subfamily Thlaeodontinae Cope 1892 (opossum)
Mammalia - Didelphimorphia - Didelphidae
Alternative spelling: Thlaeodontidae
Parent taxon: Didelphidae according to O. P. Hay 1930
Sister taxa: Caluromyinae, Caroloameghiana, Cladodidelphys, Cryptonanus, Dasyurina, Derorhynchinae, Didelphinae, Dimerodon, Eobrasiliinae, Herpetotheriinae, Hyladelphinae, Marmosinae, Marmosops, Marmosopsini, Peratotherium, Sparassocyninae, Sparassocynini, Thylamyinae
Subtaxa: Thlaeodon
Type: Thlaeodon
Ecology: scansorial omnivore-carnivore
Distribution: found only at Crooked Creek (Cretaceous of Montana)