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Apatosaurus ajax

Reptilia

Taxonomy
Apatosaurus ajax was named by Marsh (1877). Its type specimen is YPM 1860, a partial skeleton, and it is a 3D body fossil. Its type locality is Lakes Quarry 10, Morrison (YPM), which is in a Kimmeridgian/Tithonian channel mudstone/sandstone in the Morrison Formation of Colorado.

It was recombined as Atlantosaurus ajax by Steel (1970); it was considered a nomen dubium by Galiano and Albersdörfer (2010) and Galiano and Albersdörfer (2010).

Synonymy list
YearName and author
1877Apatosaurus ajax Marsh
1878Apatosaurus ajax King p. 346
1880Apatosaurus ajax Sauvage p. 523
1890Apatosaurus ajax Zittel p. 706
1896Apatosaurus ajax Marsh p. 167
1897Apatosaurus ajax Marsh p. 491
1901Apatosaurus ajax Nopcsa p. 203
1902Apatosaurus ajax Hay p. 485
1916Apatosaurus ajax Mook p. 135
1917Apatosaurus ajax Mook p. 357
1930Apatosaurus ajax Hay p. 195
1931Apatosaurus ajax Johnson p. 358
1964Apatosaurus ajax Tatarinov p. 547
1970Atlantosaurus ajax Steel p. 79
1970Apatosaurus ajax Swinton p. 176
1975Apatosaurus ajax Mcintosh and Berman p. 197
1981Apatosaurus ajax McIntosh p. 23
1990Apatosaurus ajax McIntosh p. 61
1994Apatosaurus ajax Filla and Redman p. 161
1995Apatosaurus ajax McIntosh p. 122
2004Apatosaurus ajax Upchurch et al. p. 264
2004Apatosaurus ajax Upchurch et al.
2006Apatosaurus ajax Chure et al. p. 236
2006Apatosaurus ajax Harris p. 1110
2006Apatosaurus ajax Mateus p. 231
2007Apatosaurus ajax Schwarz et al. p. 245
2013Apatosaurus ajax Tschopp and Mateus p. 880
2014Apatosaurus ajax Saegusa and Ikeda p. 12
2015Apatosaurus ajax Tschopp et al.
2016Apatosaurus ajax Foster and Peterson p. 436
2021Apatosaurus ajax Ren et al. p. 1876

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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
—Diapsida()
RankNameAuthor
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Saurischia()
—Sauropoda()
—Gravisauria
—Eusauropoda
—Neosauropoda
—Diplodocoidea()
—Diplodocimorpha
—Flagellicaudata
—Diplodocidae()
subfamilyApatosaurinae
genusApatosaurus
speciesajax

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.

†Apatosaurus ajax Marsh 1877
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Diagnosis
No diagnoses are available