Younginiformes

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Younginiformes
Temporal range: Middle Permian–Early Triassic
Youngina skull lateral.png
Skull of Youngina
Youngina capensis.png
Life restoration of Youngina
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Neodiapsida
Order:† Younginiformes
Romer, 1945
Families

Younginiformes is a group of diapsid reptiles known from the Permian-Triassic of Africa and Madagascar. It has been used as a replacement for "Eosuchia". [1] Younginiformes (including Acerosodontosaurus , Hovasaurus , Kenyasaurus , Tangasaurus , Thadeosaurus and Youngina ) were historically suggested to be lepidosauromorphs, but are currently thought to be basal non-saurian neodiapsids. [2] [3] The group is sometimes divided into two families, Tangasauridae and Younginidae. The monophyly of the group is disputed. A 2009 study found them to be an unresolved polytomy at the base of Neodiapsida, [4] while a 2011 study recovered the group as paraphyletic. [5] A 2022 study recovered the Younginiformes as a monophyletic group of basal neodiapsid reptiles, also including Claudiosaurus and Saurosternon as part of the group. [6] Some younginiforms like Hovasaurus and Acerosodontosaurus are thought to have had an amphibious lifestyle, while others like Kenyasaurus, Thadeosaurus and Youngina were probably terrestrial. [4] [7]

Contents

Classification

Included genera:

2011 phylogeny showing a paraphyletic Younginiformes: [5]

Neodiapsida

Phylogeny of Younginiformes from Simões et al. 2022: [6]

Sauropsida

References

  1. ↑ Gauthier, J.; Estes, R.; de Queiroz, K. (1988). "A phylogenetic analysis of Lepidosauromorpha" (PDF). In R. Estes; G. Pregill (eds.). Phylogenetic relationships of the lizard families. Stanford: Stanford University Press. pp. 15–98. Archived (PDF) from the original on 2023-12-09.
  2. ↑ Laurin, Michel (January 1991). "The osteology of a Lower Permian eosuchian from Texas and a review of diapsid phylogeny" . Zoological Journal of the Linnean Society. 101 (1): 59–95. doi:10.1111/j.1096-3642.1991.tb00886.x.
  3. ↑ Ezcurra, Martín D.; Scheyer, Torsten M.; Butler, Richard J. (2014-02-27). Ketmaier, Valerio (ed.). "The Origin and Early Evolution of Sauria: Reassessing the Permian Saurian Fossil Record and the Timing of the Crocodile-Lizard Divergence". PLOS ONE. 9 (2): e89165. Bibcode:2014PLoSO...989165E. doi: 10.1371/journal.pone.0089165 . ISSN   1932-6203. PMC   3937355 . PMID   24586565.
  4. 1 2 Bickelmann; Müller; Reisz (2009). "The enigmatic diapsid Acerosodontosaurus piveteaui (Reptilia: Neodiapsida) from the Upper Permian of Madagascar and the paraphyly of "younginiform" reptiles". Canadian Journal of Earth Sciences. 46 (9): 651–661. Bibcode:2009CaJES..46..651S. doi:10.1139/E09-038.
  5. 1 2 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.
  6. 1 2 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.
  7. ↑ Buffa, Valentin; Jalil, Nour‐Eddine; Falconnet, Jocelyn; Vincent, Peggy (2025-03-23). "The neodiapsid Thadeosaurus colcanapi from the upper Permian of Madagascar". Papers in Palaeontology . 11 (2). doi: 10.1002/spp2.70008 . ISSN   2056-2799.

Sources


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