Classification of Gates et al. 2011

G. †Iguanodon Mantell 1825
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†Iguanodon bernissartensis Boulenger 1881
G. †Prosaurolophus Brown 1916
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G. †Gryposaurus Lambe 1914
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†Gryposaurus monumentensis Gates and Sampson 2007
†Gryposaurus notabilis Lambe 1914
Subfm. †Hadrosaurinae Lambe 1918 [hadrosaurine]
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Unr. †Brachylophosaurini Gates et al. 2011
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G. †Acristavus Gates et al. 2011
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†Acristavus gagslarsoni Gates et al. 2011
G. †Brachylophosaurus Sternberg 1953
G. †Maiasaura Horner and Makela 1979
Unr. †Hadrosauroidea Huene 1954
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G. †Lophorhothon Langston 1960
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†Lophorhothon atopus Langston 1960