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Dryosaurus altus

Reptilia - Dryosauridae

Taxonomy
Laosaurus altus was named by Marsh (1878). Its type specimen is YPM 1876 and is a 3D body fossil. Its type locality is Quarry 13, Como Bluff (YPM), which is in a Kimmeridgian/Tithonian crevasse splay sandstone/claystone in the Morrison Formation of Wyoming. It is the type species of Laosaurus.

It was misspelled as Laosaurus altas by Gegenbaur (1898); it was considered a nomen dubium by Bakker et al. (1990); it was recombined as Dryosaurus altus by Marsh (1894), Marsh (1896), Nopcsa (1901), Hay (1902), Nopcsa (1902), Lull (1911), Mook (1916), Gilmore (1925), Hay (1930), Swinton (1936), Avinoff (1940), Stokes (1949), Untermann and Untermann (1954), Tatarinov (1964), Kuhn (1964), Galton (1972), Galton and Jensen (1973), Galton and Jensen (1973), Galton (1975), Madsen and Miller (1979), Jurcsak and Popa (1979), Molnar (1980), Galton (1980), Galton (1981), McIntosh (1981), McGinnis (1982), Weishampel and Weishampel (1983), Galton (1983), Galton (1989), Sues and Norman (1990), Scheetz (1991), Weishampel and Heinrich (1992), Carpenter (1994), Chure et al. (1994), Ryan (1997), Naish and Martill (2001), Buchholz (2002), Norman (2004), Stanford et al. (2004), Mateus (2006), Chure et al. (2006), Pereda Suberbiola et al. (2006), Hübner and Rauhut (2007), Ruiz-Omeñaca et al. (2007), Ruiz-Omeñaca et al. (2007), Galton (2007), Butler et al. (2008), Galton (2009), Horner et al. (2009), Rich et al. (2010), McDonald et al. (2010), McDonald et al. (2010), Zheng et al. (2013), Becerra et al. (2016), Dieudonné et al. (2016), Herne et al. (2018), Xu et al. (2018), Carpenter and Galton (2018), Bell et al. (2018), Madzia et al. (2018), Herne et al. (2019), Cruzado-Caballero et al. (2019), Bell et al. (2019), Andrzejewski et al. (2019), Dieudonné et al. (2020), Dalla Vecchia (2020), Sánchez-Fenollosa et al. (2021) and Rotatori et al. (2022).

Synonymy list
YearName and author
1878Laosaurus altus Marsh
1880Laosaurus altus Sauvage p. 523
1881Laosaurus altus Boulenger p. 9
1890Laosaurus altus Zittel p. 756
1894Dryosaurus altus Marsh p. 86
1896Dryosaurus altus Marsh p. 198
1898Laosaurus altas Gegenbaur p. 577
1901Dryosaurus altus Nopcsa p. 209
1902Dryosaurus altus Hay p. 501
1902Dryosaurus altus Nopcsa p. 152
1911Dryosaurus altus Lull p. 204
1916Dryosaurus altus Mook p. 147
1925Dryosaurus altus Gilmore p. 394
1930Dryosaurus altus Hay p. 206
1936Dryosaurus altus Swinton p. 573
1940Dryosaurus altus Avinoff p. 31
1949Dryosaurus altus Stokes p. 9
1954Dryosaurus altus Untermann and Untermann p. 90
1964Dryosaurus altus Kuhn p. 7
1964Dryosaurus altus Tatarinov p. 555
1972Dryosaurus altus Galton p. 466
1973Dryosaurus altus Galton and Jensen p. 129
1975Dryosaurus altus Galton p. 748
1979Dryosaurus altus Jurcsak and Popa p. 40
1979Dryosaurus altus Madsen and Miller p. 26
1980Dryosaurus altus Galton p. 103
1980Dryosaurus altus Molnar p. 135 fig. 6
1981Dryosaurus altus Galton p. 272
1981Dryosaurus altus McIntosh p. 30
1982Dryosaurus altus McGinnis p. 74
1983Dryosaurus altus Galton p. 232
1983Dryosaurus altus Weishampel and Weishampel p. 44
1989Dryosaurus altus Galton p. 218
1990Dryosaurus altus Sues and Norman p. 500
1991Dryosaurus altus Scheetz p. 27
1992Dryosaurus altus Weishampel and Heinrich p. 171
1994Dryosaurus altus Carpenter p. 288
1994Dryosaurus altus Chure et al. p. 304
1997Dryosaurus altus Ryan p. 197
2001Dryosaurus altus Naish and Martill p. 81
2002Dryosaurus altus Buchholz p. 19
2004Dryosaurus altus Norman p. 414
2004Dryosaurus altus Stanford et al. p. 257
2006Dryosaurus altus Chure et al. p. 237
2006Dryosaurus altus Mateus p. 231
2006Dryosaurus altus Pereda Suberbiola et al. p. 227
2007Dryosaurus altus Galton p. 38
2007Dryosaurus altus Hübner and Rauhut p. 372
2007Dryosaurus altus Ruiz-Omeñaca et al. p. 10
2007Dryosaurus altus Ruiz-Omeñaca et al. p. 85
2008Dryosaurus altus Butler et al. p. 8
2009Dryosaurus altus Galton p. 215
2009Dryosaurus altus Horner et al. p. 737
2010Dryosaurus altus McDonald et al. p. 33 fig. 39
2010Dryosaurus altus McDonald et al. p. 808 fig. 10
2010Dryosaurus altus Rich et al. p. 394
2013Dryosaurus altus Zheng et al.
2016Dryosaurus altus Becerra et al. p. 558
2016Dryosaurus altus Dieudonné et al. p. 28
2018Dryosaurus altus Bell et al. p. 26
2018Dryosaurus altus Carpenter and Galton pp. 183, 187
2018Dryosaurus altus Herne et al. p. 15
2018Dryosaurus altus Madzia et al. p. 969
2018Dryosaurus altus Xu et al. p. 562
2019Dryosaurus altus Andrzejewski et al. p. 38
2019Dryosaurus altus Bell et al. p. 4
2019Dryosaurus altus Cruzado-Caballero et al. p. 214
2019Dryosaurus altus Herne et al. p. 568
2020Dryosaurus altus Dalla Vecchia p. 612
2020Dryosaurus altus Dieudonné et al.
2021Dryosaurus altus Sánchez-Fenollosa et al. p. 54
2022Dryosaurus altus Rotatori et al. p. 132

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
RankNameAuthor
Diapsida()
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Genasauria
Cerapoda
Ornithopoda()
Clypeodonta
Iguanodontia()
Dryomorpha
familyDryosauridae
genusDryosaurus
speciesaltus()

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.

Dryosaurus altus Marsh 1878
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Diagnosis
ReferenceDiagnosis
K. Carpenter and P. M. Galton 2018Dryosaurus altus is characterized by cheek teeth having a narrow midline-ridge and two to three fine longitudinal ridges on the enameled surface; a horizontal maxillary ramus of jugal below orbit slender as in D. lettowvorbecki (or Dysalotosaurus lettowvorbecki). Basal tuberae are a posteroventral sheet or wedge and there are no midline sulcus, as in D. lettowvorbecki. Anterior cervical vertebrae are short and tall as in D. lettowvorbecki. Ilium long and low compared to most ornithopods, but less than D. elderae. The preacetabular process are gently curved, postacetabular process proportionally short and deep as compared to D. elderae.