†subfamily Thaumastocyoninae Hurzeller 1940 (bear-dog)
Mammalia - Carnivora - Amphicyonidae
Parent taxon: Amphicyonidae according to V. J. Sach and E. P. J. Heizmann 2001
Sister taxa: Amphicyanis, Amphicyoninae, Angelarctocyon, Aphicyoninae, Arctamphicyon, Aymardia, Bonisicyon, Brachycyon, Cynodictis, Cyotherium, Daphoeninae, Guangxicyon, Gustafsonia, Haplocyoninae, Harpagophagus, Notoamphicyon, Protemnocyon, Pseudamphicyon, Pseudocyonopsis, Storchictis, Symplectocyon, Temnocyoninae
Subtaxa: Agnotherium Ammitocyon Crassidia Peignecyon Thaumastocyon Tomocyon Ysengrinia
Ecology: ground dwelling carnivore
Distribution: