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Orodromeus makelai

Reptilia

Taxonomy
Orodromeus makelai was named by Horner and Weishampel (1988). Its type specimen is MOR 294, a partial skeleton, and it is a 3D body fossil. Its type locality is Egg Mountain, MOR TM-006, which is in a Judithian terrestrial carbonate in the Two Medicine Formation of Montana.

Synonymy list
YearName and author
1988Orodromeus makelai Horner and Weishampel
1990Orodromeus makelai Sues and Norman p. 500
1991Orodromeus makelai Scheetz p. 27
1991Orodromeus makelai Weishampel et al. p. 207
1992Orodromeus makelai Weishampel and Heinrich p. 171
1993Orodromeus makelai Fukuda and Obata p. 99
1993Orodromeus makelai Zhao and Li p. 82
1994Orodromeus makelai Moratalla and Powell p. 42
1994Orodromeus makelai Vianey-Liaud and Crochet p. 241
1995Orodromeus makelai Wang and Zhou p. 263
1997Orodromeus makelai Horner p. 205
1997Orodromeus makelai Schweitzer p. 459
1997Orodromeus makelai Sues p. 357
2001Orodromeus makelai Eberth et al. p. 57
2001Orodromeus makelai Horner et al. p. 8
2001Orodromeus makelai Trexler p. 305
2002Orodromeus makelai Buchholz p. 19
2002Orodromeus makelai Varricchio et al. p. 564
2004Orodromeus makelai Norman et al. p. 395
2008Orodromeus makelai Butler et al. p. 10
2009Orodromeus makelai Butler and Sullivan p. 26
2009Orodromeus makelai Butler and Zhao p. 66
2009Orodromeus makelai Galton p. 214
2009Orodromeus makelai Horner et al. p. 735
2012Orodromeus makelai Han et al. p. 1391 fig. 14
2013Orodromeus makelai Brown et al. p. 512
2016Orodromeus makelai Becerra et al. p. 559
2016Orodromeus makelai Hübner p. 323
2018Orodromeus makelai Bell et al. p. 24
2018Orodromeus makelai Herne et al. p. 45
2019Orodromeus makelai Andrzejewski et al. p. 8
2019Orodromeus makelai Cruzado-Caballero et al. p. 216
2019Orodromeus makelai Herne et al. p. 568
2019Orodromeus makelai Párraga and Prieto-Márquez p. 251
2020Orodromeus makelai Dieudonné et al.

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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()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Ornithopoda()
subfamilyOrodrominae
genusOrodromeus
speciesmakelai

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.

†Orodromeus makelai Horner and Weishampel 1988
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Diagnosis
ReferenceDiagnosis
R. J. Butler et al. 2008Prominent boss on anterolateral maxilla;subnarial depression on premaxilla–maxilla boundary; midline depression on nasals; boss on jugal; postorbital with distinct projection into orbit; dentition plesiomorphic with ridges absent lingually and labially.
Measurements
partNmeanminimummaximummedians.d.
femur diameter36.121.5017.09.007.75
tibia diameter49.876.0016.010.04.20

Composition: hydroxyapatiteo
Entire body: yesg
Adult length: 10 to < 100o
Adult width: 1.0 to < 10o
Adult height: 1.0 to < 10o
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: gregariouso
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: herbivoresubo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2005-08-25 06:00:14
Modified: 2005-08-25 08:00:14
Source: g = genus, subo = suborder, o = order
References: Peczkis 1995, Benton 1983, Marsh 1875

Age range: base of the Middle Campanian to the top of the Late/Upper Maastrichtian or 83.50000 to 66.00000 Ma

Collections (8 total)


Time interval Ma Country or state Original ID and collection number
Campanian83.6 - 72.1USA (Montana) Hypsilophodontidae indet. (13281 22653) Orodromeus makelai (22690 53043)
Judithian83.5 - 70.6USA (Montana) Orodromeus makelai (type locality: 14453)
Middle Campanian83.5 - 70.6USA (Montana) Orodromeus sp. (25658)
Middle Campanian - Late/Upper Campanian83.5 - 70.6USA (Montana) Thescelosaurus neglectus (14446)
Late/Upper Maastrichtian70.6 - 66.0USA (Montana) Thescelosaurus neglectus (13142)