Thylacosmiliformes
| Thylacosmiliformes | |
|---|---|
| Skull of Thylacosmilus | |
| Lower jaw of Anachlysictis | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Sparassodonta |
| Superfamily: | †Borhyaenoidea |
| Clade: | †Thylacosmiliformes Suarez et al., 2025 |
| Type species | |
| Thylacosmilus atrox Riggs, 1933 | |
| Subgroups | |
Thylacosmiliformes is an extinct clade of predatory metatherian mammals in the order Sparassodonta, related to the marsupials. Members of this clade are known from the Miocene and Pliocene epochs of South America (Argentina, Colombia, and Uruguay). The most notable thylacosmiliforms, such as Thylacosmilus, comprise the more exclusive family Thylacosmilidae and have prominent saber teeth.
The clade was defined in 2025 to include thylacosmilids and their more "primitive" closest relatives such as Dimartinia.