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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.

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.

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

References

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.
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.
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.

v t e Sauropsida (Reptilia sensu lato)
Kingdom: Animalia Phylum: Chordata Superclass: Tetrapoda Clade: Amniota Tetrapodomorpha see Tetrapodomorpha Reptiliomorpha see Reptiliomorpha Sauropsida see below↓
Sauropsida Sauropsida †Australothyris †Erpetonyx †Microleter †Acleistorhinidae Acleistorhinus Carbonodraco Colobomycter Delorhynchus Feeserpeton Karutia Klastomycter †Bolosauridae Belebey Bolosaurus Eudibamus †Mesosauria Brazilosaurus Mesosaurus Stereosternum †Millerettidae Broomia Heleophilus Milleretta Millerosaurus Milleropsis Nanomilleretta †Procolophonia see Procolophonia Diapsida see below↓
Diapsida Diapsida †Adelosaurus? †Claudiosaurus †Cryptovaranoides †Dolerosaurus †Elachistosuchus †Eunotosaurus? †Feralisaurus †Heleosuchus †Kenyasaurus †Kudnu †Lanthanolania †Maiothisavros †Microzemiotes †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus? Hovasaurus Tangasaurus †Weigeltisauridae Coelurosauravus Glaurung Rautiania Weigeltisaurus †Drepanosauromorpha Ancistronychus Avicranium Dolabrosaurus Drepanosaurus Hypuronector Kyrgyzsaurus Longisquama? Megalancosaurus Protoavis? Skybalonyx Unguinychus Vallesaurus †Kuehneosauridae Icarosaurus Idiosaura? Kuehneosaurus Kuehneosuchus Pamelina Rhabdopelix? †Choristodera see Choristodera †Ichthyosauromorpha see Ichthyosauromorpha †Sauropterygia see Sauropterygia †Thalattosauria see Thalattosauria Sauria (Crown-Reptilia) Lepidosauromorpha see Lepidosauromorpha Includes Lepidosauria includes rhynchocephalians and squamates Archelosauria Archosauromorpha see Archosauromorpha Includes Archosauria includes birds and crocodilians Pantestudines see Pantestudines Includes Testudines turtles
See also Possible sauropsids Araeoscelidia Captorhinidae Protorothyrididae Recumbirostra Varanopidae Other taxa Anapsida Captorhinida Eureptilia Parareptilia Lanthanosuchoidea Millerosauria Procolophonomorpha Ankyramorpha Neodiapsida Eosuchia Younginiformes Avicephala Eolacertilia Euryapsida
Category

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• Diapsids
• Prehistoric reptile genera
• Lopingian reptiles of Africa
• Early Triassic reptiles of Africa
• Changhsingian genus first appearances
• Induan genus extinctions
• Fossils of Madagascar
• Permian Madagascar
• Triassic Madagascar
• Fossil taxa described in 1981
• Permian reptile stubs