Thylacosmilus

Thylacosmilus is an extinct genus of South American sparassodont mammal known for long, saber-like upper canine teeth and protective bony flanges along the lower jaw.

Sparassodonta: Sparassodonta is an extinct group of predatory metatherian mammals that lived mainly in South America. Thylacosmilus belongs to this group, rather than to the true cats that independently evolved saber teeth.
Saber-tooth: A saber-tooth is an elongated, blade-like canine found in several extinct mammal lineages. Thylacosmilus’s upper canines were unusually long and continued growing throughout its life.
Thylacosmilus atrox: Thylacosmilus atrox is the best-known and type species of the extinct genus Thylacosmilus. Its fossils provide the principal evidence for the genus’s anatomy and lifestyle.
Saber-toothed predator ecology: Saber-toothed predator ecology examines how elongated canine teeth shaped hunting and feeding strategies. Thylacosmilus challenges assumptions that all saber-toothed mammals killed prey in the same way.
Metatheria: Metatheria is the mammal lineage that includes living marsupials and their extinct relatives. Thylacosmilus was a metatherian, though it was not a member of the modern marsupial crown group.
Mandibular flange: A mandibular flange is a bony projection along the lower jaw that can protect or support other structures. Thylacosmilus had prominent flanges that shielded its long upper canines when its mouth was closed.
Huayquerian: The Huayquerian is a South American land-mammal age of the late Miocene. Thylacosmilus fossils are associated with Huayquerian deposits in Argentina.
Convergent evolution: Convergent evolution is the independent evolution of similar traits in different lineages. Its resemblance to saber-toothed cats arose independently, despite their distant relationship.
Canine tooth: A canine is a usually pointed tooth near the front of a mammal’s mouth. Its enlarged upper canines dominate Thylacosmilus’s skull and give the genus its saber-toothed appearance.
Carnassial: A carnassial is a specialized cheek tooth that shears food in many carnivorous mammals. Its cheek teeth, rather than its sabers alone, would have helped process prey.

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