Smilodon gracilis
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{{Taxobox | color = pink | name = Smilodon gracilis | status = Conservation status: Fossil | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Carnivora | familia = Felidae | subfamilia = Machairodontinae | genus = Smilodon | species = S. gracilis | binomial = Smilodon gracilis | binomial_authority = Cope, 1880 }} Smilodon gracilis ("the slender Smilodon") was the smallest and earliest of the "smilodont" machairodontine saber-toothed cats. It first appeared in the United States about 2.5 million years ago, probably a descendant of Megantereon, and lived until about 500,000 years ago. It lived mainly in the eastern regions of the Americas.
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