English: Cast of the holotype (ANSP 12546) of Panthera atrox (Leidy, 1853), which consists of purely a left mandibular ramus. The original specimen was recovered from Pleistocene deposits near Natchez, Mississippi, and later described by Joseph Leidy as a species of Felis, naming it Felis atrox. This species is now part of the genus Panthera.
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