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Lesothosaurus diagnosticus

Reptilia -

Taxonomy
Lesothosaurus diagnosticus was named by Galton (1978). Its type specimen is BMNH RU (UCL) B17, a skull, and it is a 3D body fossil. Its type locality is north flank, Likhoele Mountain (UCL), which is in a Hettangian/Sinemurian terrestrial sandstone in the Elliot Formation of Lesotho.

It was synonymized subjectively with Fabrosaurus australis by Hunt and Lucas (1994) and Peng (1997).

Synonymy list
YearName and author
1978Lesothosaurus diagnosticus Galton pp. 156-157
1980Lesothosaurus diagnosticus Coombs p. 381
1982Lesothosaurus diagnosticus Coombs, Jr. p. 102
1983Lesothosaurus diagnosticus Weishampel and Weishampel p. 44
1984Lesothosaurus diagnosticus Olsen and Galton p. 91
1985Lesothosaurus diagnosticus Maryanska and Osmólska p. 146
1991Lesothosaurus diagnosticus Sereno p. 169
1994Lesothosaurus diagnosticus Chure et al. p. 306
2001Lesothosaurus diagnosticus Vickaryous et al. p. 1773
2004Lesothosaurus diagnosticus Norman et al. p. 326
2004Lesothosaurus diagnosticus Weishampel p. 323
2005Lesothosaurus diagnosticus Butler pp. 184-185
2006Lesothosaurus diagnosticus Langer and Benton p. 318 fig. 4
2006Lesothosaurus diagnosticus Pereda Suberbiola et al. p. 227
2007Lesothosaurus diagnosticus Butler et al. p. S12
2007Lesothosaurus diagnosticus Upchurch et al. p. 75
2008Lesothosaurus diagnosticus Butler et al. p. 10
2008Lesothosaurus diagnosticus Irmis and Knoll p. 121
2009Lesothosaurus diagnosticus Butler and Sullivan p. 22
2009Lesothosaurus diagnosticus Butler and Zhao p. 65
2010Lesothosaurus diagnosticus Langer et al. p. 86
2010Lesothosaurus diagnosticus McDonald et al. p. 33 fig. 39
2012Lesothosaurus diagnosticus Han et al. p. 1391 fig. 14
2012Lesothosaurus diagnosticus Kammerer et al. p. 281
2013Lesothosaurus diagnosticus Zheng et al.
2014Lesothosaurus diagnosticus Arbour et al. p. 2
2015Lesothosaurus diagnosticus Verdú et al. p. 256
2016Lesothosaurus diagnosticus Dieudonné et al. p. 30
2016Lesothosaurus diagnosticus Griffin and Nesbitt p. 6
2018Lesothosaurus diagnosticus Madzia et al. p. 968

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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()
genusLesothosaurus
speciesdiagnosticus

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
R. J. Butler 2005Lesothosaurus diagnosticus cannot be diagnosed on the basis of autapomorphic features. However, it is distinguishable from all other ornithischians on the basis of a unique combination of primitive and derived character states and should be considered a metataxon (sensuGauthier, 1986), pending further discoveries. This unique character combination comprises: anterior premaxillary foramen present; slot in maxilla for lacrimal present; six premaxillary teeth present; absence of diastema between the premaxillary and maxillary teeth; maxillary teeth lack apicobasally extending ridges on their lingual and labial faces; manual phalanges lacking prominent intercondylar processes; ilium with well-developed supraacetabular flange and ventromedially angling brevis shelf visible in lateral view; dorsal groove on the ischial shaft present; shaft of ischium twists through 90° along its length, forms an elongate symphysis with the opposing ischial blade, and lacks a tab-shaped obturator process; prepubic process short and mediolaterally flattened rather than rodlike and does not extend beyond the end of the preacetabular process of the ilium; postcranial osteoderms absent.