A new species of the primitive dinosaur Thecodontosaurus (Saurischia: Sauropodomorpha) and its implications for the systematics of early dinosaurs

@article{Yates2003ANS,
  title={A new species of the primitive dinosaur Thecodontosaurus (Saurischia: Sauropodomorpha) and its implications for the systematics of early dinosaurs},
  author={Adam Michael Yates},
  journal={Journal of Systematic Palaeontology},
  year={2003},
  volume={1},
  pages={1 - 42}
}
  • A. Yates
  • Published 1 January 2003
  • Biology, Geography, Environmental Science
  • Journal of Systematic Palaeontology
Synopsis Juvenile sauropodomorph specimens from a Late Triassic/Early Jurassic fissure fill in Pant‐y‐ffynnon Quarry, South Wales are redescribed and named as a new species, Thecodontosaurus caducus. T. caducus can be diagnosed by the presence of pleurocoel‐like pits on the neurocentral sutures of the sixth, seventh and eighth cervical vertebrae. It is further distinguished from the type species of the genus, T. antiquus, by the primitive shape of its proximal humerus and ilium. Data from this… 
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171 Citations

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References

SHOWING 1-10 OF 73 REFERENCES

ANATOMY AND SYSTEMATICS OF THE PROSAUROPOD DINOSAUR THECODONTOSAURUS ANTIQUUS FROM THE UPPER TRIASSIC OF SOUTHWEST ENGLAND

Abstract Re-examination of the surviving specimens of Thecodontosaurus antiquus indicates that this plesiomorphic sauropodomorph can be diagnosed on the basis of elongate basipterygoid processes, a…

Dinosaurian precursors from the Middle Triassic of Argentina: Marasuchus lilloensis, gen. nov.

Several synapomorphies unite Marasuchus and dinosaurs (as Dinosauriformes) to the exclusion of the contemporary dinosauromorph Lagerpeton and pterosaurs.

The phylogenetic relationships of sauropod dinosaurs

The results suggest that there are dangers inherent in the view that ‘higher’ level sauropod phylogeny can be accurately reconstructed using only a small number of well-known taxa, and that the results of the randomization tests indicate that the data-matrix probably contains a strong phylogenetic ‘signal’.

The Evolutionary History of Sauropod Dinosaurs

Forked chevrons, which have played such an important role in previous studies of sauropod phylogeny, are here considered to have evolved twice within the Sauropoda, which may reflect a correlation between chevron shape and the use of the tail as a weapon within these twosauropod families.

New information on the systematics and postcranial skeleton of Herrerasaurus ischigualastensis (Ther

New evidence supports this group as saurischian dinosaurs: the posterior process of the jugal is forked, a hyposphene-hypantrum articulation is present in dorsal vertebrae, the distal shaft of the ischium is rod-like, and six other saurishian synapomorphies are present.

Early Evolution and Higher-Level Phylogeny of Sauropod Dinosaurs

The cladistic analysis presented here focuses on higher-level relationships among sauropods, and identifies Neosauropoda as a new taxon that includes Haplocanthosaurus, Camarasaurus, and Titanosauriformes.

A new carnosaur (Dinosauria, Theropoda) from the Jurassic of Xinjiang, People's Republic of China

In 1987, a Sino-Canadian expedition known as the Dinosaur Project (China – Canada – Alberta – Ex Terra) discovered a large theropod skeleton in the Upper Jurassic Shishugou Formation of the Junggar…

Dinosaurian precursors from the Middle Triassic of Argentina: Lagerpeton chanarensis

There is no evidence that Lagerpeton and other small-bodied dinosauromorphs in the Los Chanares fauna, namely “Lagosuchus” lilloensis, comprise a monophyletic group.

New prosauropod material from South Wales

New prosauropod material from a cave filling of Upper Triassic/Lower Jurassic age in Pant-y-ffynnon Quarry, South Wales, is described and ascribed to Thecodonlosaurus sp.

On the origin of the sauropods and the classification of the Saurischia

Re-examination of melanorosaurid material in South Africa shows that none is properly associated and that the proportions cannot be determined, and concepts of sauropodomorph phylogeny are incompatible with the stratigraphical position of the Melanorosauridae below the Thecodontosauridae (in South Africa).
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