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Agilisaurus louderbacki

Reptilia -

Taxonomy
Agilisaurus louderbacki was named by Peng (1990). Its type specimen is ZDM 6011, a skeleton, and it is a 3D body fossil. Its type locality is Dashanpu Dinosaur Quarry, Xiashaximiao, which is in a Bajocian/Callovian lacustrine sandstone/mudstone in the Xiashaximiao Formation of China.

Synonymy list
YearName and author
1990Agilisaurus louderbacki Peng figs. 1-6
1992Agilisaurus louderbacki Peng p. 39 figs. 1-6
1997Agilisaurus louderbacki Dong p. 121
1997Agilisaurus louderbacki Peng p. 238
2004Agilisaurus louderbacki Norman et al. p. 394
2005Agilisaurus louderbacki Barrett et al. pp. 830-831 fig. 5
2008Agilisaurus louderbacki Butler et al. p. 8
2009Agilisaurus louderbacki Butler and Sullivan p. 26
2012Agilisaurus louderbacki Han et al. p. 1391 fig. 14
2012Agilisaurus louderbacki Zheng et al. p. 208

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
RankNameAuthor
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Neornithischia()
genusAgilisaurusPeng 1990
specieslouderbackiPeng 1990

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
ReferenceDiagnosis
P. M. Barrett et al. 2005(characters from the original diagnosis marked with ‘*’). A small ornithischian dinosaur that can be distinguished from other basal ornithischians by the presence of several cranial autapomorphies: presence of a palpebral/ supraorbital bar that traverses the width of the orbit* (acquired convergently in Dryosaurus); premaxillary teeth opposing three teeth in the rostral part of the dentary*; rostralmost dentary teeth conical, resembling premaxillary teeth; presence of a series of low, rostrolaterally directed ridges on the orbital portion of the frontal; and presence of an excavation or embayment on the ascending process of the maxilla, immediately rostral to the antorbital fossa.
R. J. Butler et al. 2008Presence of a palpebral/supraorbital bar that traverses the width of the orbit; anteriormost dentary teeth conical, resembling premaxillary teeth; presence of a series of low, anterolaterally directed ridges on the orbital portion of the frontal; presence of an excavated area immediately anterior to the antorbital fossa.