Classification of Horner et al. 2009

G. †Dryosaurus Marsh 1894
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†Dryosaurus altus Marsh 1878
G. †Tenontosaurus Ostrom 1970
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†Tenontosaurus tilletti Ostrom 1970
G. †Maiasaura Horner and Makela 1979
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†Maiasaura peeblesorum Horner and Makela 1979
G. †Hypacrosaurus Brown 1913
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†Hypacrosaurus stebingeri Horner and Currie 1994
G. †Orodromeus Horner and Weishampel 1988
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†Orodromeus makelai Horner and Weishampel 1988