Araeoscelis

Araeoscelis
Temporal range: Artinskian 284.4–275.6 Ma
Life restoration
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: †Araeoscelidia
Family: †Araeoscelidae
Genus: †Araeoscelis
Williston 1910
Type species
Araeoscelis gracilis
Williston 1910
Species
  • †A. casei (Broom 1913)
  • †A. gracilis Williston 1910
Synonyms
  • Ophiodeirus Broom 1913

Araeoscelis (from Greek: αραιά araiá, 'thin' and Greek: σκελίς skelís, 'ribs of beef')[1] is an extinct genus of tetrapods from the Early Permian of what is now Texas. Fossils have been found in the Nocona, Arroyo and Waggoner Ranch Formations. Two species have been described, A. casei and A. gracilis.[2]

Araeoscelis belonged to the clade Araeoscelidia together with close relatives such as Petrolacosaurus. Araeoscelidia is often considered the most basal group of diapsid reptiles, but some analyses have recovered them as stem-amniotes instead.[3][4]

Description

1914 restoration by Samuel Wendell Williston

Araeoscelis was around 60 centimetres (2.0 ft) long, and superficially resembled a modern lizard. It differed from other araeoscelidians, such as Petrolacosaurus, in that its teeth were larger and blunter; possibly they were used for cracking insect carapaces.[5]

Unlike Petrolacosaurus, which possessed the two pairs of skull openings characteristic of diapsids, in Araeoscelis the lower pair of temporal fenestrae were closed with bone, resulting in a euryapsid condition. This would have made the skull more solid, presumably allowing a more powerful bite.[5]

Ichnology

Footprints found in Nova Scotia have been attributed to Araeoscelis or a close relative.[2]

References

  1. ^ Colbert, Edwin H. (Edwin Harris); Knight, Charles Robert (1951). The dinosaur book : the ruling reptiles and their relatives. New York : Published for the American Museum of Natural History by McGraw-Hill. p. 145. Retrieved 17 December 2022.
  2. ^ a b Dixon, Dougal (2015). The Complete Illustrated Encyclopedia of Dinosaurs. London: Hermes House.
  3. ^ Simões, Tiago R.; Kammerer, Christian F.; Caldwell, Michael W.; Pierce, Stephanie E. (2022-08-19). "Successive climate crises in the deep past drove the early evolution and radiation of reptiles". Science Advances. 8 (33): eabq1898. Bibcode:2022SciA....8.1898S. doi:10.1126/sciadv.abq1898. ISSN 2375-2548. PMC 9390993. PMID 35984885.
  4. ^ Klembara, J.; Ruta, M.; Anderson, J.; Mayer, T.; Hain, M.; Valaška, D. (2023). "A review of Coelostegus prothales Carroll and Baird, 1972 from the Upper Carboniferous of the Czech Republic and the interrelationships of basal eureptiles". PLOS ONE. 18 (9): e0291687. Bibcode:2023PLoSO..1891687K. doi:10.1371/journal.pone.0291687. PMC 10513281.
  5. ^ a b Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 82. ISBN 1-84028-152-9.

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