Ticholeptus zygomaticus Ticholeptus is an extinct genus of oreodont endemic to North America during the Middle Miocene epochs (16.0—13.6 mya), existing for approximately 2.4 million years.

[1] Fossils have been uncovered throughout the U.S. from Florida to Oregon, as well as California, and numerous sites in Nebraska, Nevada, and Montana.

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