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Echinodon becklesii

Reptilia - Heterodontosauridae

Taxonomy
Echinodon becklesii was named by Owen (1861). Its type specimen is BMNH 48209, 48210, a mandible, and it is a 3D body fossil. Its type locality is cliff face, Durlston Bay, which is in a Berriasian fluvial-lacustrine limestone in the Lulworth Formation of the United Kingdom.

It was recombined as Saurechinodon becklesii by Kuhn (1964); it was misspelled as Echinodon becklesi by Macfadyen (1970), Thulborn (1975), Galton (1978), Galton (1981), Weishampel and Weishampel (1983), Sereno (1991), Galton (1994), Pereda Suberbiola and Galton (2001), Norman and Barrett (2002), Norman et al. (2004), Pereda Suberbiola et al. (2006), Sánchez-Hernández et al. (2007), Naish and Martill (2007), Galton (2007), Butler et al. (2008), Naish and Martill (2008), Butler and Galton (2008) and Sereno (2012).

Synonymy list
YearName and author
1861Echinodon becklesii Owen pp. 35-39
1888Echinodon becklesii Lydekker p. 247
1888Echinodon becklesii Mansel-Pleydell p. 8
1890Echinodon becklesi Woodward and Sherborn p. 227
1890Echinodon becclesi Zittel p. 742
1915Echinodon becklesii Hennig p. 10
1960Echinodon becklesi Delair p. 84
1964Saurechinodon becklesii Kuhn p. 37
1970Echinodon becklesi Macfadyen p. 143
1975Echinodon becklesii Thulborn p. 99
1978Echinodon becklesii Galton p. 155
1981Echinodon becklesii Galton p. 35
1983Echinodon becklesii Weishampel and Weishampel p. 44
1991Echinodon becklesii Sereno p. 176
1994Echinodon becklesii Galton p. 256
2001Echinodon becklesii Pereda Suberbiola and Galton p. 152
2002Echinodon becklesii Norman and Barrett p. 172
2004Echinodon becklesii Norman et al. p. 394
2006Echinodon becklesi Pereda Suberbiola et al. p. 228
2007Echinodon becklesii Galton p. 27 fig. 2.7
2007Echinodon becklesii Naish and Martill p. 495
2007Echinodon becklesii Sánchez-Hernández et al. p. 201
2008Echinodon becklesii Butler and Galton p. 641
2008Echinodon becklesii Butler et al. p. 9
2008Echinodon becklesii Naish and Martill p. 613
2012Echinodon becklesii Sereno p. 31

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

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. 2008One, or possibly two, caniniform teeth situated at the anterior end of the maxilla.
P. C. Sereno 2012Heterodontosaurid ornithischian characterized by the follow- ing six autapomorphies: (1) slender, nearly straight caniniform first maxillary tooth with unornamented anterior and posterior carinae; (2) edentulous anterior dentary margin (as long as two alveoli); (3) only 9 dentary teeth posterior to the caniniform tooth; (4) dentary crowns in the middle of the tooth row that are proportionately taller than opposing maxillary crowns (the apical 50% of middle dentary crowns are den- ticulate versus 25% of mid maxillary crowns); (5) anteroposteriorly elongate dentary symphysis (maximum length approximately 3 times maximum depth); (6) symphyseal flange ventral to primary dentary symphysis.