†unranked clade Thylacosmilinae Riggs 1933 (metatherian)
Mammalia - Sparassodonta - Proborhyaenidae
Full reference: E. S. Riggs. 1933. Preliminary description of a new marsupial sabertooth fom the Pliocene of Argentina. Geological Series of Field Museum of Natural History 6:61-66
Parent taxon: Proborhyaenidae according to R. K. Engelman et al. 2020
See also Riggs 1933
Sister taxa: Arminiheringia, Callistoe, Paraborhyaena, Proborhyaena
Subtaxa: Eomakhaira
Ecology: scansorial carnivore
Distribution: found only at Cachapoal (Oligocene of Chile)