Classification of Hirschfeld and Webb 1968
†Morotherium leptonyx Marsh 1874
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†Sinclairia oregoniana Ameghino 1912
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Fm. †Megalonychidae Gervais 1855
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G. †Pliometanastes Hirschfeld and Webb 1968
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†Pliometanastes galushai Hirschfeld and Webb 1968
†Pliometanastes protistus Hirschfeld and Webb 1968
G. †Megalonyx Harlan 1825
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†Megalonyx gigas Marsh 1874
†Megalonyx mathisi Hirschfeld and Webb 1968
Invalid names: Morotherium Marsh 1874 [synonym]
†Megalonyx wheatleyi Cope 1871
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Invalid names: Megalonyx loxodon Cope 1871 [synonym], Megalonyx sphenodon Cope 1871 [synonym], Megalonyx tortulus Cope 1871 [synonym]