Amynodon
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Amynodon is an extinct genus of amynodont that lived in North America during the Middle Eocene, from the late Bridgerian to the late Uintan land mammal age. Several species of Amynodon have been named
Amynodon avenus skeleton AMNH
Later North American amynodonts, such as Metamynodon (pictured), may not have been descended from Amynodon, since their closest known relatives are known from outside North America
Early Uintan river landscape painted by Charles R. Knight, with Orohippus (left) and Uintatherium (right)
Heptodon posticus
Metamynodon
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Metamynodon is an extinct genus of amynodont that lived in North America from the Middle Eocene to the Middle Oligocene. Metamynodon was a large, robust, and semiaquatic animal that displayed a suite
Amynodon
…obvious semiaquatic adaptations; such adaptations did evolve in amynodonts, but may have been restricted to the more derived metamynodontines, such as Metamynodon. Amynodon was instead interpreted as a terrestrial browser. The broad range of Amynodon across the modern-day United States further support to this…
Metamynodon skeleton
Painting of M. planifrons by Heinrich Harder (c. 1920)
Hind limbs, pelvis, and tail of M. planifrons