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Heterodontosaurus tucki

Reptilia - Heterodontosauridae

Taxonomy
Heterodontosaurus tucki was named by Crompton and Charig (1962). Its type specimen is SAFM K337, a skull, and it is not a trace fossil. Its type locality is Tyindini (zone B/1), which is in a Sinemurian terrestrial horizon in the Clarens Formation of South Africa. It is the type species of Heterodontosaurus.

It was recombined as Lycorhinus tucki by Thulborn (1970), Thulborn (1974), Thulborn (1975) and Thuborn (1978).

Synonymy list
YearName and author
1962Heterodontosaurus tucki Crompton and Charig p. 1075 fig. 1
1965Heterodontosaurus tucki Simmons p. 69ff
1970Heterodontosaurus tucki Ellenberger p. 347
1970Heterodontosaurus tucki Swinton p. 196
1970Lycorhinus tucki Thulborn p. 244
1974Heterodontosaurus tucki Charig and Crompton p. 187
1974Heterodontosaurus tucki Ellenberger p. 9
1974Lycorhinus tucki Thulborn p. 154
1975Heterodontosaurus tucki Hopson pp. 302-303
1975Lycorhinus tucki Thulborn p. 129
1976Heterodontosaurus tucki Santa Luca et al. p. 324
1978Lycorhinus tucki Thuborn p. 187
1980Heterodontosaurus tucki Santa Luca p. 162
1983Heterodontosaurus tucki Weishampel and Weishampel p. 44
1984Heterodontosaurus tucki Olsen and Galton p. 91
1985Heterodontosaurus tucki Maryanska and Osmólska p. 145
1990Heterodontosaurus tucki Weishampel and Witmer p. 487
1992Heterodontosaurus tucki Weishampel and Heinrich p. 173
1994Heterodontosaurus tucki Chure et al. p. 307
1997Heterodontosaurus tucki Chinsamy p. 677
1997Heterodontosaurus tucki Smith p. 317
1999Heterodontosaurus tucki Casanovas et al. p. 348
2001Heterodontosaurus tucki Báez and Marsicano p. 273
2004Heterodontosaurus tucki Norman et al. p. 394
2006Heterodontosaurus tucki Langer and Benton p. 331 fig. 8
2007Heterodontosaurus tucki Butler et al. p. S14
2007Heterodontosaurus tucki Upchurch et al. p. 75
2008Heterodontosaurus tucki Butler et al. p. 701
2008Heterodontosaurus tucki Butler et al. p. 9
2008Heterodontosaurus tucki Irmis and Knoll p. 123
2009Heterodontosaurus tucki Butler and Sullivan p. 26
2009Heterodontosaurus tucki Butler and Zhao p. 68
2012Heterodontosaurus tucki Kammerer et al. p. 281
2012Heterodontosaurus tucki Sereno p. 85 figs. 2C, 38-72, 88-96, 101
2014Heterodontosaurus tucki Delsate and Ezcurra p. 178
2016Heterodontosaurus tucki Dieudonné et al. p. 29

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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()
familyHeterodontosauridae
genusHeterodontosaurus
speciestucki

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 et al. 2008Basal ornithischian dinosaur characterized by the following autapomorphies: deep buccal emargination is formed by a strongly dorsoventrally compressed and transversely expanded shelf that forms the ventral margin of the external antorbital fenestra and is thickened at its lateral margin; columnar maxillary and dentary teeth are not expanded mesiodistally or labiolingually above the root ('cingulum' completely absent); lateral surface of maxillary crowns possess three prominent ridges separated by sharply defined excavated regions; extensive wear facets form a continuous wear surface along maxillary and dentary tooth rows.
R. J. Butler et al. 2008Dorsal process of premaxilla does not form contact with nasals; anterior, accessory opening present within the antorbital fossa; squamosal–quadratojugal contact is anteroposteriorly broad; paroccipital processes are very deep dorsoventrally; paired, deep recesses on the ventral surface of the basisphenoid; basisphenoid processes are extremely elongated; cingulum is completely absent on cheek-teeth; ischium with elongate flange on lateral margin.
P. C. Sereno 2012Heterodontosaurid ornithischian characterized by the fol- lowing autapomorphies: (1) cheek tooth crowns subrectangular in cross-section; (2) prominent crown margins and primary ridge resulting in mesial and distal paracin- gular fossae on labial and lingual faces of maxillary and dentary crowns, respectively; (3) asymmetrical enamel on maxillary and dentary crowns (reduced in thickness on lingual and labial sides of maxillary and dentary crowns, respectively); (4) lacrimal with shallow lateral fossa; (5) jugal with extension of antorbital fossa onto the orbital ramus; (6) jugal flange posteroventrally inclined; (7) trapezoidal anterior surangular foramen; (8) axis and C3 neural spine with lateral flange; (9) C5 and C6 neural spines project anterodorsally; (10) C3-C7 with subcylindrical parapophyses; (11) mid dorsal verte- brae (D6-D10) with Y-shaped transverse processes (for di- and parapophyses); (12) scapulocoracoid foramen absent; (13) humeral epicondyles present; (14) lobe-shaped distal expansion of the iliac preacetabular process; (15) ischial peduncle narrow, co- lumnar; (16) ischial shaft with laterally-directed crescentic flange at mid-length; (17) femoral anterior and greater trochanters coossified; (18) tibiofibulotarsus coossifica- tion (possibly variable); (19) tarsometatarsus coossification.