Machairodontinae

Machairodontinae is an extinct subfamily of cats distinguished by enlarged upper canine teeth. It includes Smilodon, Homotherium, and other saber-toothed felids.

Felidae: Felidae is the mammal family comprising living cats and their extinct relatives. Machairodontinae is one extinct branch within the cat family.
Saber-tooth: A saber-tooth is an elongated, blade-like canine tooth in an extinct predatory mammal. Machairodontines developed multiple forms of enlarged upper canine.
Smilodon: Smilodon is an extinct genus of saber-toothed cats from the Americas, known for its exceptionally elongated upper canines. It is the best-known machairodontine and exemplifies the dirk-toothed form.
Proailurus: Proailurus is an extinct genus of small carnivorans often regarded as among the earliest known cats. Its fossils help frame the much earlier history of the cat lineage.
Barbourofelidae: Barbourofelidae is an extinct family of carnivorans with saber-like canines, distinct from the cat family. Its members resembled saber-toothed cats but were not machairodontine felids.
Canine tooth: A canine is a pointed tooth near the front of a mammal’s mouth, often used for gripping or puncturing. The subfamily is named for its enlarged upper canine teeth.
Canine shear-bite model: The canine shear-bite model proposes that saber-toothed cats used neck and jaw movements to drive canines into prey. It explains how long canines could inflict deep wounds without breaking.
Homotherium: Homotherium is an extinct genus of machairodontine cats with shorter, serrated upper canines and long limbs. Its build contrasts with the more compact, long-canined Smilodon.
Pseudaelurus: Pseudaelurus is an extinct genus of felids that lived during the Miocene and is associated with early cat diversification. Machairodontines emerged amid the diversification of early felids.
Nimravidae: Nimravidae is an extinct family of cat-like carnivorans that evolved saber-like teeth independently of true cats. Nimravids are a separate saber-toothed lineage, not members of Felidae.

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Saber-toothed predatorBroader topic: This is the cat lineage most commonly associated with saber-toothed predators.