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Pantydraco caducus

Reptilia -

Taxonomy
Thecodontosaurus caducus was named by Yates (2003). Its type specimen is BMNH P24, a partial skeleton, and it is a 3D body fossil. Its type locality is Pant-y-ffynnon Quarry, Bonvilston, which is in a Rhaetian fissure fill limestone/marl in the United Kingdom. It is the type species of Pantydraco.

It was synonymized subjectively with Thecodontosaurus antiquus by Galton (2005); it was recombined as Pantydraco caducus by Galton et al. (2007), Galton (2007), Galton and Kermack (2010), Langer et al. (2010), Apaldetti et al. (2011), Delsate and Ezcurra (2014), Griffin and Nesbitt (2016) and Martill et al. (2016).

Synonymy list
YearName and author
2003Thecodontosaurus caducus Yates pp. 2-21 figs. 1-21
2005Thecodontosaurus caducus Yates p. 117
2007Thecodontosaurus caducus Barrett et al. p. 321
2007Pantydraco caducus Galton p. 511
2007Pantydraco caducus Galton et al. p. 123
2007Thecodontosaurus caducus Naish and Martill p. 496
2007Thecodontosaurus caducus Upchurch et al. p. 76
2010Pantydraco caducus Galton and Kermack
2010Pantydraco caducus Langer et al. p. 71
2011Pantydraco caducus Apaldetti et al. p. 4
2014Pantydraco caducus Delsate and Ezcurra p. 177
2016Pantydraco caducus Griffin and Nesbitt p. 1
2016Pantydraco caducus Martill et al. p. 3

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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
subclassEureptilia()
RankNameAuthor
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Eusaurischia
Sauropodomorpha(Huene 1932)
genusPantydraco
speciescaducus()

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
A. M. Yates 2003 A species of Thecodontosaurus with the following autapomorphy: pleurocoel-like pits on the neurocentral sutures of the sixth, seventh and eighth cervical vertebrae. T. caducus can be further distinguished from T. antiquus by exhibiting the plesiomorphic state for the autapomorphies of that species. These include a medial tubercle of the proximal humerus that does not project strongly (versus strongly projecting in T. antiquus) and a preacetabular process of the ilium that projects cranially (versus a downcurved preacetabular process in T. antiquus).
P. M. Galton et al. 2007An autapomorphy is the pseudopleurocoel, the opening to the pneumatic cavity on the neurocentral suture of the sixth to eighth cervical vertebrae (Fig. 1C). Humerus plesiomorphic with a small tubercle medial to head and an anteroposteriorly low asymmetrical deltopectoral crest with the apex at 40% of humeral length (Fig. 1E-G).