Classification of Osborn 1924
G. †Stegomastodon Pohlig 1912
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†Stegomastodon aftoniae Osborn 1924
†Stegomastodon mirificus Leidy 1858
†Stegomastodon nebrascensis Osborn 1924
†Stegomastodon texanus Osborn 1924
Invalid names: Rhabdobunus Hay 1914 [synonym]
Subfm. †Longirostrinae
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G. †Tetralophodon Falconer 1857
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Subg. †Tetralophodon (Lydekkeria) Osborn 1924
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†Tetralophodon (Lydekkeria) falconeri Lydekker 1880
Subg. †Tetralophodon (Tetralophodon) Falconer 1857
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†Tetralophodon (Tetralophodon) longirostris Kaup 1832
†Stegomastodon chapmani Osborn 1924
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Invalid names: Mastodon chapmani Hays 1834 [objective synonym]