Younginiformes
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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]
Classification
Included genera:
- Tangasauridae
- Acerosodontosaurus Currie, 1980Script error: No such module "Check for unknown parameters".
- Hovasaurus Piveteau, 1926Script error: No such module "Check for unknown parameters".
- Kenyasaurus Harris & Carroll, 1977Script error: No such module "Check for unknown parameters".
- Saurosternon? Huxley, 1868Script error: No such module "Check for unknown parameters".
- Tangasaurus Haughton, 1924Script error: No such module "Check for unknown parameters".
- Younginidae
- Claudiosaurus? Carroll, 1981Script error: No such module "Check for unknown parameters".
- Heleosuchus? Owen, 1876Script error: No such module "Check for unknown parameters".
- Thadeosaurus Carroll, 1981Script error: No such module "Check for unknown parameters".
- Youngina Broom, 1914Script error: No such module "Check for unknown parameters".
2011 phylogeny showing a paraphyletic Younginiformes:[5]
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Phylogeny of Younginiformes from Simões et al. 2022:[6] Script error: No such module "Clade".
References
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Sources
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