FIG. 21 in Eomakhaira molossus, A New Saber-Toothed Sparassodont (Metatheria: Thylacosmilinae) from the Early Oligocene (?Tinguirirican) Cachapoal Locality, Andean Main Range, Chile

FIG. 21. Temporal durations of major lineages of mammalian saber-toothed carnivores, with metatherian lineage in grey and placental lineages in black. A representative skull of each clade is depicted to the right; from top to bottom: Thylacosmilus atrox (Thylacosmilinae), Machaeroides eothen (Machaeroidinae), Hoplophoneus primaevus (Nimravidae), Barbourofelis fricki (Barbourofelidae) and Smilodon fatalis (Machairodontinae). Images of Machaeroides, Barbourofelis, and Smilodon modified from Antón (2013), Thylacosmilus from Riggs (1934), and Hoplophoneus from Scott and Jepsen (1936) and Bryant (1996). Tick mark on Thylacosmilinae record represents the oldest occurrence of this clade (~20.2 Ma) prior to the discovery of Eomakhaira. Abbreviations: Plio., Pliocene; Ple., Pleistocene.