Classification of Forster and Spamer 1986

G. †Apatosaurus Marsh 1877
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Apatosaurus excelsus Marsh 1879
Invalid names: Brontosaurus Marsh 1879 [synonym]
G. †Hadrosaurus Leidy 1858
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Hadrosaurus foulkii Leidy 1858
G. †Smilodon Lund 1841 [saber-toothed cat]
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Smilodon floridanus Leidy 1889
G. †Megalonyx Harlan 1825
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Megalonyx jeffersonii Desmarest 1822 [Jefferson's ground sloth]