Classification of Trexler 2001

G. †Maiasaura Horner and Makela 1979
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Maiasaura peeblesorum Horner and Makela 1979
G. †Prosaurolophus Brown 1916
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G. †Styracosaurus Lambe 1913
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Styracosaurus ovatus Gilmore 1930
G. †Gryposaurus Lambe 1914
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Gryposaurus latidens Horner 1992
G. †Einiosaurus Sampson 1994
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G. †Achelousaurus Sampson 1994
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Achelousaurus horneri Sampson 1994
G. †Hypacrosaurus Brown 1913
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Hypacrosaurus stebingeri Horner and Currie 1994
G. †Edmontonia Sternberg 1928
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Edmontonia rugosidens Gilmore 1930
G. †Orodromeus Horner and Weishampel 1988
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Orodromeus makelai Horner and Weishampel 1988