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Atlascopcosaurus loadsi

Reptilia

Taxonomy
Atlascopcosaurus loadsi was named by Rich and Vickers-Rich (1989). Its type specimen is NMV P166409, a set of limb elements, and it is a 3D body fossil. Its type locality is Dinosaur Cove East, which is in an Albian floodplain horizon in the Eumeralla Formation of Australia. It is the type species of Atlascopcosaurus.

It was considered a nomen dubium by Agnolin et al. (2010).

Synonymy list
YearName and author
1989Atlascopcosaurus loadsi Rich and Vickers-Rich p. 31 figs. 9-11
1990Atlascopcosaurus loadsi Sues and Norman p. 500
1992Atlascopcosaurus loadsi Molnar p. 265
1994Atlascopcosaurus loadsi Rich and Vickers-Rich p. 4
1996Atlascopcosaurus loadsi Molnar p. 646 fig. 8
1996Atlascopcosaurus loadsi Rich p. 715
1997Atlascopcosaurus loadsi Sues p. 357
2004Atlascopcosaurus loadsi Norman et al. p. 394
2006Atlascopcosaurus loadsi Scanlon p. 280
2008Atlascopcosaurus loadsi Hocknull and Cook p. 212
2009Atlascopcosaurus loadsi Galton p. 221
2018Atlascopcosaurus loadsi Bell et al. p. 1
2018Atlascopcosaurus loadsi Herne et al. p. 2
2019Atlascopcosaurus loadsi Herne et al. p. 562
2020Atlascopcosaurus loadsi Dieudonné et al. p. 411
2021Atlascopcosaurus loadsi Duncan et al. p. 8

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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()
—Elasmaria
genusAtlascopcosaurus
speciesloadsi

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.

†Atlascopcosaurus loadsi Rich and Vickers-Rich 1989
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Diagnosis
ReferenceDiagnosis
R. J. Duncan et al. 2021Small-bodied ornithopod characterized by the following features (potential autapomorphies marked with a *): (1*) Maxilla with ventral projection of posteromedial process; (2) Maxilla with as many as 15 alveoli, showing broad size disparity between largest and smallest alveolus: largest alveoli at midpoint of toothrow, smallest at mesial and distal ends; (3) Maxillary toothrow posterodistally inclined approximately 20° relative to coronal plane; (4) Maxillary teeth with centrally located, u-shaped cingular vertex (Herne et al., 2019); (5) Maxillary teeth with pronounced ridge emargination on the labial surface and which lack ornamentation with the exception of marginal denticles on the lingual surface (Rich and Rich, 1989); (6) Maxillary teeth with four secondary ridges distal to primary ridge, contrasting with two in similarly sized Galleonosaurus dorisae exemplars (Herne et al., 2019); (7) Maxillary teeth with six secondary ridges mesial to primary ridge, contrasting with four in similarly sized Galleonosaurus dorisae exemplars (Herne et al., 2019).