Classification of Hatcher 1902
Fm. †Trachodontidae Lydekker 1888
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G. †Trachodon Leidy 1856
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†Trachodon annectens Marsh 1892
Invalid names: Cionodon Cope 1874 [synonym], Claorhynchus Cope 1892 [synonym], Diclonius Cope 1876 [synonym], Hadrosaurus Leidy 1858 [synonym], Ornithotarsus Cope 1869 [synonym], Polyonax Cope 1874 [synonym], Pteropelyx Cope 1889 [synonym], Thespesius Leidy 1856 [synonym]
Invalid names: Claosauridae Marsh 1890 [synonym], Hadrosauridae Cope 1869 [synonym]