Basic info  Taxonomic history  Classification  Relationships 
Morphology  Ecology and taphonomy  External Literature Search  Age range and collections 
Hadrosauridae (hadrosaurid)
Reptilia  Hadrosauridae
Taxonomy
Hadrosauridae was named by Cope (1869).
It was synonymized subjectively with Trachodontidae by Lydekker (1888), Marsh (1895), Marsh (1896), Hatcher (1902), Hay (1902), Matthew (1915), Nagao (1936) and Nagao (1939); it was synonymized subjectively with Trachydontidae by ManselPleydell (1902); it was synonymized subjectively with Trachyodontidae by Sauvage (1909); it was reranked as the unranked clade Hadrosauridae by Campione and Evans (2011).
It was assigned to Ornithopoda by Zittel (1890); to Orthopoda by Cope (1869), Cope (1870), Cope (1871), Cope (1875), Cope (1883), Cope (1883), Cope (1891) and Cope (1898); to Ornithopoda by Van Den Broeck (1900); to Phytophagi by Jaekel (1914); to Predentata by Gilmore (1919); to Dinosauria by Rapp (1944); to Brachypoda by Thulborn (1974) and Thulborn (1977); to Ornitophoda by Bonaparte (1978); to Dryosauroidea by Norman (1984); to Ornithopoda by Dollo (1882) and Bakker (1986); to Styracosterna by Benton (1990); to Hadrosauria by Huene (1959) and Horner (1990); to Iguanodontia by Baur (1891), Russell (1984), Norman (1989) and Forster (1997); to Ornithopoda by Sauvage (1882), Marsh (1882), Dollo (1884), Marsh (1884), Marsh (1885), Winkler (1893), Russell (1930), Lull and Wright (1942), Sternberg (1953), Sternberg (1954), Miller (1955), Romer (1956), Parsch (1963), Tatarinov (1964), Estes (1964), Kuhn (1964), Kuhn (1966), Romer (1966), Miller (1967), Swinton (1970), Thulborn (1970), Haubold (1971), Rozhdestvensky (1977), Baird and Horner (1979), Dong (1979), Benton (1979), Ostrom (1980), McIntosh (1981), Thurmond and Jones (1981), Weishampel and Weishampel (1983), Milner and Norman (1984), Norman (1984), Carroll (1988), Nessov (1995) and Peng et al. (2001); to Ornithischia by Eberth et al. (2001); to Iguanodontoidea by Casamiquela (1964), Cooper (1985) and Norman (2004); to Hadrosauriformes by You et al. (2005); to Hadrosauromorpha by Norman (2014); to Ornithopoda by Le Loeuff (1998), CruzadoCaballero et al. (2010), Campione and Evans (2011) and Freedman Fowler and Horner (2015); to Hadrosauroidea by Dalla Vecchia (2009), PrietoMárquez (2012), Tan et al. (2015) and CruzadoCaballero and Powell (2017); and to Hadrosauroidea by Sereno (1986), Horner (1992), Hunt and Lucas (1993), Sereno (1997), Sereno (1998), Godefroit et al. (1998), Sereno (1999), Casanovas et al. (1999), You et al. (2003), Godefroit et al. (2004), Bolotsky and Godefroit (2004), PrietoMárques et al. (2006), PrietoMárquez et al. (2006), Godefroit et al. (2008), PeredaSuberbiola et al. (2009), Sues and Averianov (2009), McDonald et al. (2010), PrietoMarquez and Salinas (2010), PrietoMárquez and Wagner (2010), RamírezVelasco et al. (2012) and Zhang et al. (2017).
It was synonymized subjectively with Trachodontidae by Lydekker (1888), Marsh (1895), Marsh (1896), Hatcher (1902), Hay (1902), Matthew (1915), Nagao (1936) and Nagao (1939); it was synonymized subjectively with Trachydontidae by ManselPleydell (1902); it was synonymized subjectively with Trachyodontidae by Sauvage (1909); it was reranked as the unranked clade Hadrosauridae by Campione and Evans (2011).
It was assigned to Ornithopoda by Zittel (1890); to Orthopoda by Cope (1869), Cope (1870), Cope (1871), Cope (1875), Cope (1883), Cope (1883), Cope (1891) and Cope (1898); to Ornithopoda by Van Den Broeck (1900); to Phytophagi by Jaekel (1914); to Predentata by Gilmore (1919); to Dinosauria by Rapp (1944); to Brachypoda by Thulborn (1974) and Thulborn (1977); to Ornitophoda by Bonaparte (1978); to Dryosauroidea by Norman (1984); to Ornithopoda by Dollo (1882) and Bakker (1986); to Styracosterna by Benton (1990); to Hadrosauria by Huene (1959) and Horner (1990); to Iguanodontia by Baur (1891), Russell (1984), Norman (1989) and Forster (1997); to Ornithopoda by Sauvage (1882), Marsh (1882), Dollo (1884), Marsh (1884), Marsh (1885), Winkler (1893), Russell (1930), Lull and Wright (1942), Sternberg (1953), Sternberg (1954), Miller (1955), Romer (1956), Parsch (1963), Tatarinov (1964), Estes (1964), Kuhn (1964), Kuhn (1966), Romer (1966), Miller (1967), Swinton (1970), Thulborn (1970), Haubold (1971), Rozhdestvensky (1977), Baird and Horner (1979), Dong (1979), Benton (1979), Ostrom (1980), McIntosh (1981), Thurmond and Jones (1981), Weishampel and Weishampel (1983), Milner and Norman (1984), Norman (1984), Carroll (1988), Nessov (1995) and Peng et al. (2001); to Ornithischia by Eberth et al. (2001); to Iguanodontoidea by Casamiquela (1964), Cooper (1985) and Norman (2004); to Hadrosauriformes by You et al. (2005); to Hadrosauromorpha by Norman (2014); to Ornithopoda by Le Loeuff (1998), CruzadoCaballero et al. (2010), Campione and Evans (2011) and Freedman Fowler and Horner (2015); to Hadrosauroidea by Dalla Vecchia (2009), PrietoMárquez (2012), Tan et al. (2015) and CruzadoCaballero and Powell (2017); and to Hadrosauroidea by Sereno (1986), Horner (1992), Hunt and Lucas (1993), Sereno (1997), Sereno (1998), Godefroit et al. (1998), Sereno (1999), Casanovas et al. (1999), You et al. (2003), Godefroit et al. (2004), Bolotsky and Godefroit (2004), PrietoMárques et al. (2006), PrietoMárquez et al. (2006), Godefroit et al. (2008), PeredaSuberbiola et al. (2009), Sues and Averianov (2009), McDonald et al. (2010), PrietoMarquez and Salinas (2010), PrietoMárquez and Wagner (2010), RamírezVelasco et al. (2012) and Zhang et al. (2017).
Subtaxa
Arstanosaurus, Cionodon, Claorhynchus, Diclonius, Edmontosaurinae, Eotrachodon, Euhadrosauria, Gryposaurinae, Hadrosaurinae, Hadrosaurus breviceps (syn. Diclonius pentagonus), Hadrosaurus cavatus, Hadrosaurus minor, Huaxiaosaurus, Hypsibema, Lambeosaurinae (syn. Cheneosaurinae, Stephanosaurinae), Lapampasaurus, Maiasaurinae, Microhadrosaurus, Nectosaurus, Neosaurus missouriensis, Orthomerus, Parrosaurus (syn. Neosaurus), Prohadrosaurinae, Protrachodontinae, Pteropelyx, Riabininohadros, Saurolophinae, Saurolophus krystofovici, Thespesius, Trachodon, Trachodontinae, Tridigitichnus, Troodon isfarensis, Tyrannosauropus, Willinakaqe
Synonyms

Synonymy list
Year  Name and author 

1856  Trachodon Leidy p. 72 
1856  Trachodon mirabilis Leidy p. 72 
1856  Thespesius Leidy p. 311 
1856  Thespesius occidentalis Leidy p. 311 
1857  Thespesius occidentalis Leidy p. 90 
1857  Trachodon mirabilis Leidy p. 90 
1860  Trachodon Leidy p. 140 
1860  Trachodon mirabilis Leidy p. 140 
1860  Thespesius Leidy p. 151 
1860  Thespesius occidentalis Leidy p. 151 
1868  Trachodon mirabilis Leidy p. 199 
1869  Hadrosauridae Cope p. 91 
1869  Hadrosaurus mirabilis Cope p. 98 
1869  Hadrosaurus occidentalis Cope p. 98 
1869  Hadrosaurus minor Cope p. 192 
1869  Hypsibema Cope p. 192 
1869  Hypsibema crassicauda Cope p. 192 
1870  Hypsibema crassicauda Cope 
1870  Hadrosauridae Cope p. 91 
1870  Hadrosaurus minor Cope pp. 122J 
1870  Hypsibema Cope pp. 122G 
1870  Hypsibema crassicauda Cope pp. 122G 
1870  Hadrosaurus minor Leidy p. 68 
1870  Hadrosaurus mirabilis Leidy p. 68 
1870  Thespesius occidentalis Leidy p. 68 
1870  Hadrosaurus minor Marsh p. 3 
1871  Hadrosaurus cavatus Cope 
1871  Hadrosaurus occidentalis Cope pp. 5052 
1871  Hadrosaurus minor Cope p. 51 
1871  Hypsibema crassicauda Cope pp. 211212 
1871  Hadrosauridae Cope p. 234 
1874  Cinodon Cope p. 10ff 
1874  Cinodon arctatus Cope p. 10ff 
1874  Hadrosaurus mirabilis Cope p. 19 
1874  Hadrosaurus occidentalis Cope p. 20 
1874  Cinodon Cope p. 21ff 
1874  Cinodon arctatus Cope p. 22 
1875  Cionodon Cope pp. 910 
1875  Cionodon stenopsis Cope pp. 910 
1875  Cionodon arctatus Cope p. 10 
1875  Hadrosauridae Cope p. 14 
1875  Hypsibema Cope p. 36 
1875  Hypsibema crassicauda Cope p. 36 
1875  Hadrosaurus mirabilis Cope p. 56 
1875  Hadrosaurus occidentalis Cope p. 56 
1875  Cionodon arctatus Cope p. 60 
1875  Cionodon stenopsis Cope p. 63 
1875  Hadrosaurus minor Cope p. 247 
1875  Hypsibema crassicauda Cope p. 247 
1875  Hadrosaurus cavatus Cope p. 248 
1875  Cionodon arctatus Cope p. 433 
1875  Hadrosaurus occidentalis Cope p. 433 
1875  Hadrosaurus mirabilis Cope p. 434 
1876  Diclonius Cope 
1876  Diclonius calamarius Cope 
1876  Diclonius pentagonus Cope 
1876  Diclonius perangulatus Cope 
1876  Diclonius pentagonus Cope p. 6 
1876  Diclonius Cope p. 254 
1876  Diclonius perangulatus Cope pp. 254255 
1876  Diclonius calamarius Cope p. 255 
1876  Cionodon arctatus Sauvage p. 442 
1877  Diclonius calmarius Cope p. 316 
1877  Diclonius pentagonus Cope p. 316 
1877  Diclonius perangulatus Cope p. 316 
1877  Diclonius Cope p. 572 
1877  Diclonius calamarius Cope p. 572 
1877  Diclonius pentagonus Cope p. 572 
1877  Diclonius perangulatus Cope p. 572 
1877  Trachodon Cope p. 573 
1877  Trachodon mirabilis Cope p. 573 
1877  Cionodon arctatus Cope p. 597 
1882  Cionodon Dollo 
1882  Hadrosauridae Dollo 
1882  Cionodon Marsh 
1882  Hadrosauridae Marsh 
1882  Cionodon Sauvage p. 35 
1882  Madrosauridae Sauvage p. 35 
1883  Cionodon Cope p. 99 
1883  Diclonius Cope p. 99 
1883  Diclonius mirabilis Cope p. 99 
1883  Hadrosauridae Cope p. 99 
1883  Hypsibema Cope p. 99 
1883  Cionodon arctatus Cope p. 104 
1883  Diclonius Cope p. 468 
1883  Diclonius mirabilis Cope p. 774 
1883  Hadrosauridae Cope p. 774 
1883  Orthomerus Seeley p. 248 fig. 2 
1883  Orthomerus dolloi Seeley p. 248 
1884  Diclonius mirabilis Cope p. 315 
1884  Cionodon Dollo p. 298 
1884  Diclonius Dollo p. 298 
1884  Hadrosauridae Dollo p. 298 
1884  Orthomerus Dollo p. 298 
1884  Orthomerus dolloi Hulke p. 44 
1884  Diclonius mirabilis Hulke p. 48 
1884  Cionodon Marsh p. 69 
1884  Hadrosauridae Marsh p. 69 
1885  Diclonius mirabilis Cope p. 1208 
1885  Diclonius Dollo p. 40 
1885  Cionodon Marsh p. 764 
1885  Hadrosauridae Marsh p. 764 
1886  Diclonius mirabilis Cope p. 153 
1887  Diclonius mirabilis Seeley p. 85 
1888  Trachodontidae Lydekker 
1888  Diclonius Lydekker p. 241 
1888  Orthomerus Lydekker p. 241 
1888  Orthomerus dolloi Lydekker p. 241 
1888  Trachodontidae Lydekker p. 241 
1888  Trachodon Lydekker p. 243 
1889  Diclonius mirabilis Cope pp. 904905 
1889  Pteropelyx Cope pp. 904905 
1889  Pteropelyx grallipes Cope pp. 904905 
1889  Diclonius pentagonus Cope pp. 905906 
1889  Hadrosaurus breviceps Marsh pp. 335336 figs. 45 
1890  Trachodontidae Marsh p. 424 
1890  Claosauridae Marsh p. 425 
1890  Hadrosaurus mirabilis Zittel p. 697 
1890  Hypsibema Zittel p. 748 
1890  Hadrosauridae Zittel p. 763 
1890  Cionodon Zittel p. 765 
1890  Orthomerus Zittel p. 766 
1891  Hadrosauridae Baur p. 450 
1891  Hadrosaurus mirabilis Boule p. 15 
1891  Hadrosauridae Cope p. 43 
1891  Diclonius mirabilis Cope p. 44 fig. 22 
1892  Claorhynchus Cope pp. 757758 
1892  Claorhynchus trihedrus Cope pp. 757758 
1893  Hadrosauridae Winkler p. 111 
1893  Hadrosaurus mirabilis Winkler p. 112 
1895  Cionodon Marsh 
1895  Claosauridae Marsh 
1895  Trachodon Marsh 
1896  Trachodon breviceps Marsh p. 224 figs. Pl. 75 
1896  Cionodon Marsh p. 244 
1896  Claosauridae Marsh p. 244 
1896  Trachodon Marsh p. 244 
1896  Trachodontidae Marsh p. 244 
1897  Diclonius Gadow p. 205 
1898  Hadrosauridae Cope p. 70 
1899  Trachodon mirabilis Lambe p. 69 
1900  Hadrosaurus mirabilis Nopcsa p. 556 
1900  Hadrosaurus occidentalis Nopcsa p. 556 
1900  Cionodon Nopcsa p. 557 
1900  Cionodon arctatus Nopcsa p. 557 
1900  Cionodon stenopsis Nopcsa p. 557 
1900  Hadrosaurus breviceps Nopcsa p. 557 
1900  Hadrosaurus cavatus Nopcsa p. 557 
1900  Hadrosaurus minor Nopcsa p. 557 
1900  Hypsibema Nopcsa p. 557 
1900  Hypsibema crassicauda Nopcsa p. 557 
1900  Orthomerus Nopcsa p. 558 
1900  Orthomerus dolloi Nopcsa p. 558 
1900  Hadrosauridae Van Den Broeck p. 87 
1900  Orthomerus Van Den Broeck p. 87 
1900  Orthomerus dolloi Van Den Broeck p. 87 
1900  Trachodon Van Den Broeck p. 87 
1902  Trachodon Hatcher pp. 384385 
1902  Hypsibema Hay p. 497 
1902  Hypsibema crassicauda Hay p. 497 
1902  Claorhynchus Hay p. 500 
1902  Claorhynchus trihedrus Hay p. 500 
1902  Thespesius Hay p. 502 
1902  Thespesius occidentalis Hay p. 502 
1902  Pteropelyx Hay p. 503 
1902  Pteropelyx grallipes Hay p. 503 
1902  Trachodon Hay p. 503 
1902  Trachodon breviceps Hay p. 503 
1902  Trachodon calamarius Hay p. 503 
1902  Trachodon cavatus Hay p. 503 
1902  Trachodontidae Hay p. 503 
1902  Cionodon Hay p. 504 
1902  Cionodon arctatus Hay p. 504 
1902  Cionodon stenopsis Hay p. 504 
1902  Trachodon minor Hay p. 504 
1902  Trachodon mirabilis Hay p. 504 
1902  Trachodon pentagonus Hay p. 504 
1902  Trachodon perangulatus Hay p. 504 
1902  Trachodon (Pteropelyx) selwyni Lambe 
1902  Trachodon (Pteropelyx) Lambe p. 69 
1902  Trachodon (Pteropelyx) selwyni Lambe pp. 6970 
1902  Trachodon (Pteropelyx) marginatus Lambe p. 70 
1902  Trachodon (Pteropelyx) altidens Lambe pp. 7677 figs. Pl. 4:24 
1902  Pteropelyx grallipes Lambe p. 77 
1902  Trachydontidae ManselPleydell p. lxxv 
1904  Trachodon Lucas p. 318 
1905  Cionodon Lambe p. 24 
1905  Cionodon stenopsis Lambe p. 24 
1905  Trachodon Lambe p. 24 
1905  Trachodon altidens Lambe p. 24 
1905  Trachodon marginatus Lambe p. 24 
1905  Trachodon selwyni Lambe p. 24 
1905  Trachodontidae Lambe p. 49 
1907  Claorhynchus Hatcher et al. p. 114 
1907  Claorhynchus trihedrus Hatcher et al. p. 114 
1909  Trachodontidae Arldt p. 263 
1909  Orthomerus dolloi Dollo p. 104 
1909  Cionodon Huene p. 16 
1909  Claorhynchus Huene p. 16 
1909  Diclonius Huene p. 16 
1909  Orthomerus Huene p. 16 
1909  Trachodon Huene p. 16 
1909  Trachodontidae Huene p. 16 
1909  Hypsibema Huene p. 17 
1909  Trachodon mirabilis Osborn p. 160 
1909  Cionodon Sauvage p. 377 
1909  Cionodon arctatus Sauvage p. 377 
1909  Orthomerus Sauvage p. 377 
1909  Trachodon Sauvage p. 377 
1909  Trachyodontidae Sauvage p. 377 
1910  Trachodon mirabilis Brown p. 270 
1910  Hadrosaurus mirabilis Hay p. 15 
1910  Thespesius Versluys p. 229 
1910  Thespesius occidentalis Versluys p. 229 
1911  Trachodon Lambe p. 9 
1911  Trachodon selwyni Lambe p. 9 
1911  Trachodontidae Lambe p. 9 
1911  Trachodon altidens Lambe p. 10 
1911  Trachodon marginatus Lambe p. 10 
1911  Trachodon von Zittel p. 291 
1911  Trachodontidae von Zittel p. 291 
1911  Cionodon von Zittel p. 292 
1911  Orthomerus von Zittel p. 292 
1911  Trachodon breviceps von Zittel p. 292 fig. 441 
1911  Trachodon mirabilis von Zittel p. 292 fig. 439 
1911  Claorhynchus von Zittel p. 293 
1911  Hypsibema von Zittel p. 293 
1912  Trachodon mirabilis Brown p. 106 
1913  Trachodon mirabilis Brown p. 387 
1913  Trachodon marginatus Brown p. 402 
1913  Trachodon mirabilis Brown pp. 404405 figs. 78 
1913  Trachodon marginatus Lambe p. 25 
1913  Trachodon Tornier p. 372 
1913  Trachodon mirabilis Tornier p. 372 
1914  Trachodon marginatus Bach p. 347 
1914  Trachodon mirabilis Brown p. 358 
1914  Trachodon Brown p. 377 
1914  Trachodon altidens Brown p. 379 
1914  Trachodon marginatus Brown p. 379 
1914  Trachodon selwyni Brown p. 379 
1914  Stephanosaurus marginatus Brown pp. 560562 
1914  Trachodon Brown p. 564 
1914  Trachodontidae Huene p. 41 
1914  Trachodon mirabile Huene p. 588 figs. Pl. 11:4 
1914  Hadrosauridae Jaekel p. 197 
1914  Stephanosaurus marginatus Lambe pp. 1719 
1914  Trachodon marginatus Lambe pp. 133134 
1914  Gryposaurus selwyni Lambe pp. 148149 
1914  Stephanosaurus marginatus Lambe p. 293 
1915  Thespesius Gilmore pp. 658660 
1915  Trachodon Gilmore pp. 658659 
1915  Thespesius occidentalis Gilmore p. 659 
1915  Stephanosaurus marginatus Lambe p. 117 
1915  Trachodon Matthew p. 28 
1915  Trachodontidae Matthew p. 32 
1915  Protrachodontidae Nopcsa 
1915  Orthomerus Nopcsa p. 8 
1915  Orthomerus dolloi Nopcsa p. 8 
1915  Trachodon Nopcsa p. 8 
1916  Trachodon marginatus Brown p. 710 
1916  Trachodontidae Gilmore p. 281 
1916  Stephanosaurus marginatus Lambe p. 193 
1917  Stephanosaurus marginatus Gilmore p. 41 
1917  Diclonius Lambe pp. 6667 
1917  Diclonius mirabilis Lambe p. 67 
1918  Trachodon mirabilis Lambe pp. 135139 
1918  Diclonius Lambe p. 138 
1918  Stephanosaurus marginatus Sternberg p. 90 
1919  Hadrosauridae Gilmore p. 64 
1920  Diclonius Lambe pp. 6768 
1920  Trachodontidae Parks p. 9 
1922  Trachodon Joleaud p. 62 
1923  Orthomerus Nopcsa p. 105 
1923  Trachodontidae Nopcsa p. 126 
1923  Trachodontidae Osborn 
1923  Trachodon altidens Versluys p. 2 
1923  Trachodon marginatus Versluys p. 2 
1923  Trachodon mirabilis Versluys p. 2 
1923  Trachodon selwyni Versluys p. 2 
1924  Thespesius Gilmore p. 14 
1924  Diclonius mirabilis Gilmore p. 25 
1924  Kritosaurus marginatus Gilmore p. 33 
1924  Thespesius Gilmore p. 34 
1924  Trachodon Lull p. 240 
1924  Trachodontidae Lull p. 240 
1926  Thespesius Moodie p. 73 
1927  Trachodontidae Huene p. 259 
1927  Trachodon Huene p. 260 
1927  Trachodon altidens Huene p. 260 
1927  Trachodon breviceps Huene p. 260 
1927  Trachodon calamarius Huene p. 260 
1927  Trachodon marginatus Huene p. 260 
1927  Trachodon mirabilis Huene p. 260 
1927  Trachodon pentagonus Huene p. 260 
1927  Trachodon perangulus Huene p. 260 
1927  Trachodon selwyni Huene p. 260 
1927  Thespesius Huene p. 261 
1927  Trachodon cavatus Huene p. 264 
1927  Trachodon minor Huene p. 264 
1927  Orthomerus Huene p. 267 
1927  Orthomerus dolloi Huene p. 270 
1928  Orthomerus Nopcsa p. 184 
1928  Thespesius Nopcsa p. 184 
1928  Trachodon Nopcsa p. 184 
1928  Trachodontidae Nopcsa p. 184 
1929  Trachodontidae Nopcsa p. 70 
1930  Stephanosaurus marginatus Moodie p. 437 
1930  Saurolophus krystofovici Riabinin 
1930  Diclonius mirabilis Riabinin p. 14 
1930  Hadrosaurus cavatus Russell p. 137 
1930  Hadrosaurus minor Russell p. 137 
1930  Hadrosauridae Russell p. 138 
1930  Thespesius Russell p. 140 
1930  Trachodon Russell p. 142 
1930  Kritosaurus marginatus Russell p. 148 
1930  Corythosaurus selwyni Russell p. 149 
1931  Thespesius occidentalis Johnson p. 368 
1931  Cionodon kysylkumense Riabinin p. 116 figs. Pl. 2 
1934  Trachodontidae Huene p. 15 
1935  Trachodontidae Parks p. 184 
1935  Saurolophus krischtofovici Young 
1936  Thespesius Nagao p. 213 
1936  Trachodon mirabilis Sternberg p. 652 
1936  Thespesius Sternberg p. 654 
1936  Trachodon Sternberg pp. 654655 
1937  Trachodontidae Roxo p. 65 
1942  Hadrosauridae Lull and Wright p. 133 
1942  Thespesius Lull and Wright p. 133 
1942  Trachodon Lull and Wright p. 133 
1942  Trachodon mirabilis Lull and Wright p. 149 
1942  Thespesius occidentalis Lull and Wright pp. 150151 
1942  Kritosaurus breviceps Lull and Wright pp. 170172 
1942  Procheneosaurus altidens Lull and Wright pp. 222223 
1944  Hadrosauridae Rapp p. 287 
1944  Hadrosaurus cavatus Rapp p. 287 
1944  Hadrosaurus minor Rapp p. 287 
1944  Trachodon mirabilis Young p. 195 
1944  Saurolophus kryschtofovici Young p. 202 
1945  Parrosaurus Gilmore p. 540 
1945  Parrosaurus missouriensis Gilmore p. 540 
1945  Neosaurus Gilmore and Stewart p. 25 figs. 13 
1945  Neosaurus missouriensis Gilmore and Stewart p. 25 figs. 13 
1946  Trachodontidae Kuhn p. 66 
1946  Orthomerus dolloi Riabinin p. 66 
1947  Trachodontidae Lapparent p. 18 
1947  Orthomerus Lapparent p. 33 
1947  Orthomerus dolloi Lapparent p. 33 
1948  Hadrosaurus minor Colbert 
1948  Orthomerus Huene p. 94 
1948  Protrachodontidae Huene p. 94 
1948  Trachodontidae Huene p. 94 
1948  Orthomerus Lapparent p. 1186 
1950  Hypsibema crassicaude Richards p. 7 
1953  Hadrosauridae Sternberg p. 11 
1953  Thespesius Sternberg p. 11 
1953  Trachodon Sternberg p. 11 
1954  Hadrosauridae Sternberg p. 383 
1954  Thespesius Sternberg p. 383 
1954  Trachodon Sternberg p. 383 
1954  Cionodon kisilkumense Yuryev p. 191 
1955  Hadrosauridae Miller, Jr. p. 911 
1955  Hadrosaurus cavatus Miller, Jr. p. 911 
1955  Hadrosaurus minor Miller, Jr. p. 911 
1956  Prohadrosauridae Huene p. 539 
1956  Parrosaurus Romer p. 622 
1956  Hadrosauridae Romer p. 629 
1956  Claorhynchus Romer p. 630 
1956  Hypsibema Romer p. 630 
1956  Orthomerus Romer p. 630 
1956  Thespesius Romer p. 630 
1956  Trachodon Romer p. 631 
1958  Orthomerus Young p. 106 
1958  Thespesius Young p. 106 
1959  Hadrosauridae Huene p. 122 
1959  Prohadrosauridae Huene p. 122 
1959  Saurolophus krystofovici Kobayashi p. 390 
1960  Trachodon Bataller p. 161 
1960  Orthomerus dolloi Jeletzky p. 35 
1960  Trachodon mirabilis Moore and Miller p. 57 
1960  Kritosaurus breviceps Vialli p. 176 
1962  Hadrosaurus minor Miller p. 194 
1962  Hadrosaurus cavatus Miller p. 196 
1963  Hadrosauridae Parsch p. 4 
1964  Hadrosauridae Casamiquela 
1964  Orthomerus Casamiquela 
1964  Thespesius Casamiquela 
1964  Hadrosauridae Estes p. 144 
1964  Hadrosauridae Kuhn p. 13 
1964  Cionodon Kuhn p. 16 
1964  Cionodon arctatus Kuhn p. 16 
1964  Cionodon stenopsis Kuhn p. 16 
1964  Claorhynchus Kuhn p. 16 
1964  Claorhynchus trihedrus Kuhn p. 16 
1964  Diclonius Kuhn p. 16 
1964  Diclonius pentagonus Kuhn p. 16 
1964  Diclonius perangulatus Kuhn p. 16 
1964  Diclonius calamarius Kuhn p. 17 
1964  Pteropelyx Kuhn p. 17 
1964  Pteropelyx grallipes Kuhn p. 17 
1964  Hadrosaurus minor Kuhn p. 20 
1964  Hypsibema Kuhn p. 20 
1964  Hypsibema crassicauda Kuhn p. 20 
1964  Kritosaurus breviceps Kuhn p. 21 
1964  Kritosaurus marginatus Kuhn pp. 2122 
1964  Orthomerus Kuhn p. 24 
1964  Orthomerus dolloi Kuhn p. 24 
1964  Procheneosaurus altidens Kuhn p. 26 
1964  Saurolophus krischtofovici Kuhn p. 26 
1964  Thespesius Kuhn p. 27 
1964  Thespesius occidentalis Kuhn p. 27 
1964  Trachodon Kuhn p. 27 
1964  Trachodon atavus Kuhn p. 28 
1964  Trachodon kysilkumense Kuhn p. 28 
1964  Trachodon mirabilis Kuhn p. 28 
1964  Trachodon selwyni Kuhn p. 28 
1964  Pteropelyx grallipes Russell p. 10 
1964  Trachodon mirabilis Russell p. 10 
1964  Kritosaurus marginatus Russell p. 12 
1964  Parrosaurus Tatarinov p. 552 
1964  Hadrosauridae Tatarinov p. 559 
1964  Claorhynchus Tatarinov p. 569 
1964  Hypsibema Tatarinov p. 569 
1964  Orthomerus Tatarinov p. 569 
1964  Orthomerus dolloi Tatarinov p. 569 
1964  Thespesius Tatarinov p. 569 
1964  Trachodon Tatarinov p. 569 
1966  Orthomerus Campbell p. 165 
1966  Hadrosauridae Kuhn p. 103 
1966  Claorhynchus Romer p. 370 
1966  Hadrosauridae Romer p. 370 
1966  Hypsibema Romer p. 370 
1966  Orthomerus Romer p. 370 
1966  Parrosaurus Romer p. 370 
1966  Thespesius Romer p. 370 
1966  Trachodon Romer p. 370 
1967  Hadrosauridae Miller p. 233 
1970  Parrosaurus Steel pp. 7677 
1970  Parrosaurus missouriensis Steel pp. 7677 
1970  Hadrosauridae Swinton p. 215 
1970  Hadrosauridae Thulborn p. 428 fig. 9 
1971  Orthomerus dolloi Dinca et al. p. 90 
1971  Tyrannosauropus Haubold p. 77 
1971  Tyrannosauropus petersoni Haubold p. 77 fig. 47.12 
1971  Hadrosauridae Haubold p. 89 
1974  Claorhynchus Thulborn p. 173 
1974  Hadrosauridae Thulborn p. 173 
1974  Hypsibema Thulborn p. 173 
1974  Orthomerus Thulborn p. 173 
1974  Thespesius Thulborn p. 173 
1974  Trachodon Thulborn p. 173 
1975  Trachodon Taquet p. 508 
1977  Edmontosaurus minor Baird and Horner p. 50 
1977  Hadrosauridae Rozhdestvensky p. 113 
1977  Hadrosauridae Thulborn p. 726 fig. 1 
1978  Hadrosauridae Bonaparte p. 331 
1979  Hypsibema missouriense Baird and Horner p. 7 
1979  Hypsibema Baird and Horner p. 10 
1979  Hypsibema crassicauda Baird and Horner p. 10 
1979  Hadrosauridae Baird and Horner p. 16 
1979  Hadrosauridae Benton p. 143 
1979  Hadrosauridae Dong 
1979  Microhadrosaurus Dong p. 344 figs. Pl. 1:45 
1979  Microhadrosaurus nanshiungensis Dong p. 344 figs. Pl. 1:45 
1979  Microhadrosaurus Dong p. 346 
1979  Microhadrosaurus nanshiungensis Dong p. 346 
1980  Orthomerus Buffetaut et al. p. 201 
1980  Hadrosauridae Ostrom p. 22 
1980  Kritosaurus breviceps Wolberg p. 50 
1980  Procheneosaurus altidens Wolberg p. 50 
1981  Hadrosauridae McIntosh p. 31 
1981  Hadrosauridae Thurmond and Jones p. 145 
1982  Arstanosaurus Shilin and Suslov p. 132 
1983  Hadrosauridae Weishampel and Weishampel p. 44 
1983  Orthomerus Weishampel and Weishampel p. 44 
1983  Orthomerus dolloi Weishampel and Weishampel p. 44 
1984  Orthomerus Brinkmann p. 301 
1984  Orthomerus dolloi Brinkmann p. 304 
1984  Edmontosaurus minor Gallagher p. 23 
1984  Hadrosauridae Milner and Norman p. 146 
1984  Telmatosaurus dolloi Mulder p. 108 
1984  Hadrosauridae Norman pp. 160161 fig. 2 
1984  Hadrosauridae Russell p. 29 
1984  Hypsibema Russell p. 29 
1984  Tyrannosauropus Thulborn and Wade p. 419 
1984  Tyrannosauropus petersoni Thulborn and Wade p. 449 
1985  Orthomerus Buffetaut et al. p. 65 
1985  Orthomerus dolloi Buffetaut et al. p. 65 
1985  Orthomerus CasanovasCladellas et al. p. 156 
1985  Hadrosauridae Cooper p. 287 
1986  Edmontosaurus minor Baird p. 82 
1986  Hadrosauridae Bakker p. 461 
1986  Orthomerus CasanovasCladellas et al. p. 101 
1986  Orthomerus dolloi CasanovasCladellas et al. p. 102 
1986  Microhadrosaurus nanshiungensis Guan p. 35 
1986  Hadrosauridae Sereno 
1986  Microhadrosaurus nanshiungensis Zhao p. 71 
1987  Orthomerus Casanovas et al. p. 107 
1987  Orthomerus dolloi Casanovas et al. p. 107 
1988  Hadrosauridae Carroll 
1988  Orthomerus Carroll 
1988  Trachodon mirabilis Coombs, Jr. p. 817 
1989  Hadrosauridae Norman p. 61 fig. 1 
1990  Hadrosauridae Benton p. 19 
1990  Cionodon Chapman and BrettSurman p. 177 
1990  Microhadrosaurus Chapman and BrettSurman p. 177 
1990  Hadrosauridae Horner pp. 184185 
1992  Orthomerus Buffetaut p. 133 
1992  Microhadrosaurus Dong p. 165 
1992  Orthomerus Grigorescu p. 156 
1992  Hadrosauridae Horner p. 119 
1993  Hadrosauridae Hunt and Lucas p. 80 
1993  Hypsibema crassicauda Salgado and Calvo p. 217 
1993  Hypsibema missouriensis Salgado and Calvo p. 217 
1995  Orthomerus CasanovasCladellas et al. p. 278 
1995  Orthomerus Le Loeuff and Buffetaut p. 183 
1995  Orthomerus dolloi Le Loeuff and Buffetaut p. 183 
1995  Troodon isfarensis Nessov p. 43 
1995  Hadrosauridae Nessov p. 46 
1995  Bactrosaurus kysylkumensis Nessov pp. 4748 
1997  Hadrosauridae Forster p. 47A 
1997  Arstanosaurus Ryan p. 443 
1997  Cionodon Ryan p. 443 
1997  Cionodon kysylkumense Ryan p. 443 
1997  Hadrosauridae Sereno p. 443 
1998  Hadrosauridae Godefroit et al. p. 50 fig. 38 
1998  Hadrosauridae Le Loeuff p. 56 
1998  Orthomerus Le Loeuff p. 56 
1998  Orthomerus dolloi Le Loeuff p. 56 
1998  Hadrosauridae Sereno p. 62 
1999  Hadrosauridae Casanovas et al. p. 351 fig. 3 
1999  Hadrosauridae Sereno p. 2138 fig. 2 
2000  Saurornithoides isfarensis Olshevsky p. 28 
2001  Hadrosauridae Eberth et al. p. 57 
2001  Hadrosauridae Peng et al. p. 33 
2003  Hadrosauridae You et al. p. 152 fig. 3 
2004  Hadrosauridae Bolotsky and Godefroit p. 352 
2004  Hadrosauridae Godefroit et al. p. 141 
2004  Hadrosauridae Norman p. 432 
2005  Hadrosauridae You et al. p. 789 fig. 4 
2006  Hadrosauridae PrietoMárques et al. p. 938 
2006  Hadrosauridae PrietoMárquez et al. p. 80 
2008  Hadrosauridae Godefroit et al. p. 67 fig. 18 
2009  Tyrannosauropus petersoni Boutakiout et al. p. 42 
2009  Hadrosauridae Dalla Vecchia p. 2 
2009  Hadrosauridae PeredaSuberbiola et al. p. 568 fig. 6 
2009  Hadrosauridae Sues and Averianov p. 2552 fig. 2 
2010  Hadrosauridae CruzadoCaballero et al. p. 1510 
2010  Hadrosauridae McDonald et al. p. 808 fig. 10 
2010  Hadrosauridae PrietoMarquez and Salinas p. 835 fig. 20 
2010  Hadrosauridae PrietoMárquez and Wagner p. 1243 fig. 3 
2011  Hadrosauridae Campione and Evans p. 7 
2011  Willinakaqe Juárez Valieri et al. p. 219 
2011  Willinakaqe salitralensis Juárez Valieri et al. p. 219 figs. 29 
2012  Hadrosauridae PrietoMárquez p. 529 
2012  Hadrosauridae RamírezVelasco et al. p. 392 
2013  Willinakaqe salitralensis Poropat p. 114 
2013  Willinakaqe PrietoMarquez 
2013  Willinakaqe salitralensis PrietoMarquez 
2014  Willinakaqe salitralensis Coria p. 334 
2014  Hadrosauridae Norman p. 37 fig. 2.30 
2015  Hadrosauridae Freedman Fowler and Horner 
2015  Hadrosauridae Tan et al. p. 246 
2015  Orthomerus dolloi Ulansky p. 5 
2016  Willinakaqe Lehman et al. p. 346 
2016  Willinakaqe salitralensis Lehman et al. p. 346 
2016  Willinakaqe salitralensis PrietoMárquez and Gutarra p. 141 
2016  Willinakaqe salitralensis Salisbury et al. p. 126 
2017  Hadrosauridae CruzadoCaballero and Powell p. 12 fig. 13 
2017  Hadrosauridae Zhang et al. 
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Diagnosis
Reference  Diagnosis  

E. D. Cope 1869  I. Teeth in several rows forming a vertical pavement ; metatarsals 1 three.  
L. Dollo 1882  Several rows of teeth simulate the molars of living ungulates.  
K. A. v. Zittel 1890  ZurischerikieferundPraedentcdelöffelartigausgebreitet,zahnlos. Rückenwirbel opisthocöl. Postpubis verlängert und dünn; Ischium sehr schlank, Femur mit kammjörmigem, viertem Trochanter. Oberkiefer und Unterkieferzahne in mehreren Reihen übereinander stehend und eine fast senkrechte Kaufläche bildend.  
R. S. Lull 1924 (Trachodontidae)  Premaxillaries toothless; teeth with several rows simultaneously functional; anterior vertebrae opisthoccelous ; femur generally longer than the tibia; hand fourfingered; foot fourtoed, with hooflike unguals. The tooth battery reaches its maximum development in the members of this family, there being as many as frorn 45 to 60 vertical and from 10 to 14 horizontal rows of teeth, making at least 2000 in both jaws, a very perfect adaptation to a harsh plant diet.
The trachodonts also possessed a powerful, laterally compressed tail suitable for swimming, and the hands and probably the feet w ere webbed, the skin in the hand extending paddlelike beyond the ends of the digits, as we know from the mummified specimens which have been preserved to us. There was no defensive armor, as the skin is covered everywhere with small, raised, roughly pentagonal scales, somewhat similar to those of the Gila monster, Heloderma, and never overlapping, as are those of most lizards and snakes and the fishes.  
B. F. Nopcsa 1928 (Trachodontidae)  teeth very numerous, not sculptured, rapidly replacing each other; opisthocoelous cervicals  
F. v. Huene 1948 (Trachodontidae)  Numerous teeth in several rows functioning as a unit; premaxilla in the form of a flat long ducklike beak; elongated forearm.  
F. v. Huene 1948 (Protrachodontidae)  Relatively few teeth; short premaxilla (Orthomerus, Tanus). 