Machairodonts from The Late Cenozoic of The Panhandle of Texas

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Abstract
Machairodonts represented by specimens from the Late Cenozoic of the Texas Panhandle include a small form of Machairodus (Heterofelis) from the Axtel locality (Hemphillian), and a new species, Ischyrosmilus johnstoni, from the Cita Canyon locality (Blancan). Ischyrosmilus, previously known only by two mandibles from California and Idaho, is shown by the new material to be closely related to Homotherium from the Villafranchian of Europe. Dinobastis, from the Middle and Late Pleistocene of Eurasia and North America, has close affinities with Homotherium and Ischyrosmilus. Five genera of machairodonts may now be recognized from the Pliocene and Pleistocene of North America: Sansanosmilus, Machairodus (Heterofelis), Ischyrosmilus, Dinobastis and Smilodon.

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