Thadeosaurus

Thadeosaurus; Temporal range: Changhsingian-Induan 253.8–249.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Restoration
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Diapsida
Clade:	Neodiapsida
Family:	†Younginidae
Genus:	†Thadeosaurus; Carroll 1981
Type species
	†Thadeosaurus colcanapi; Carroll 1981

Thadeosaurus is an extinct genus of diapsid reptile belonging to the family Younginidae. Fossils have been found in the Lower Sakamena Formation (Sakamena Group) of the Morondava Basin, Madagascar in 1981, and date to the late Permian to the early Triassic period.^[1]

Description

Thadeosaurus was a lizard-like animal, with a remarkably long tail that comprised about two thirds of the animal's total length of 60 centimetres (24 in). It also had long toes, especially on the hind legs, which would have given it a powerful stride, since the toes would still touch the ground while the foot was being raised. Combined with a strong breast bone to increase the strength in the forelimbs, this means that Thadeosaurus was probably a good runner.^[2]

Below is a cladogram from Reisz et al. (2011) showing the phylogenetic position of Thadeosaurus among other early diapsids:^[3]

	Acerosodontosaurus

	Hovasaurus

Younginidae

	Thadeosaurus

	Youngina

Claudiosaurus

Sauria

	Archosauromorpha

	Lepidosauromorpha

References

^ Carroll, R. L. (1981). "Plesiosaur ancestors from the Upper Permian of Madagascar". Philosophical Transactions of the Royal Society. B. 293 (1066): 315–383. Bibcode:1981RSPTB.293..315C. doi:10.1098/rstb.1981.0079.
^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 84. ISBN 978-1-84028-152-1.
^ Robert R. Reisz; Sean P. Modesto; Diane M. Scott (2011). "A new Early Permian reptile and its significance in early diapsid evolution". Proceedings of the Royal Society B. 278 (1725): 3731–3737. doi:10.1098/rspb.2011.0439. PMC 3203498. PMID 21525061.

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[1] Carroll, R. L. (1981). "Plesiosaur ancestors from the Upper Permian of Madagascar". Philosophical Transactions of the Royal Society. B. 293 (1066): 315–383. Bibcode:1981RSPTB.293..315C. doi:10.1098/rstb.1981.0079.

[EoDP-2] Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 84. ISBN 978-1-84028-152-1.

[Orovenator-3] Robert R. Reisz; Sean P. Modesto; Diane M. Scott (2011). "A new Early Permian reptile and its significance in early diapsid evolution". Proceedings of the Royal Society B. 278 (1725): 3731–3737. doi:10.1098/rspb.2011.0439. PMC 3203498. PMID 21525061.

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