PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Pantydraco caducus

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 Carnian fissure fill limestone/marl in the United Kingdom.

It was recombined as Pantydraco caducus by Galton et al. (2007), Galton (2007), Bittencourt and Kellner (2009), Galton and Kermack (2010), Langer et al. (2010), Apaldetti et al. (2011), Delsate and Ezcurra (2014), Griffin and Nesbitt (2016), Martill et al. (2016); it was synonymized subjectively with Thecodontosaurus antiquus by Galton (2005), Ballell et al. (2020).

Year	Name and author
2003	Thecodontosaurus caducus Yates pp. 2-21 figs. 1-21
2005	Thecodontosaurus caducus Yates p. 117
2007	Thecodontosaurus caducus Barrett et al. p. 321
2007	Pantydraco caducus Galton p. 511
2007	Pantydraco caducus Galton et al. p. 123
2007	Thecodontosaurus caducus Naish and Martill p. 496
2007	Thecodontosaurus caducus Upchurch et al. p. 76
2009	Pantydraco caducus Bittencourt and Kellner p. 9
2010	Pantydraco caducus Galton and Kermack
2010	Pantydraco caducus Langer et al. p. 71
2011	Pantydraco caducus Apaldetti et al. p. 4
2014	Pantydraco caducus Delsate and Ezcurra p. 177
2016	Pantydraco caducus Griffin and Nesbitt p. 1
2016	Pantydraco caducus Martill et al. p. 3

Reference	Diagnosis
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. 2007	An 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).