| image = Smilodon californicus.jpg | image_width = 250px | image_caption = Smilodon fatalis fossil at theNational Museum of Natural History, Washington, DC | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Carnivora | familia = Felidae | subfamilia = †Machairodontinae | subfamilia_authority = Gill, 1872 | subdivision_ranks = Tribes | subdivision = †Machairodontini †Smilodontini }} The Machairodontinae form a subfamily of the Felidae (true cats). It contain… (More on Machairodontinae)