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Younginidae information


Younginidae
Temporal range: Late Permian - Early Triassic 253.8–249.7 Ma
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Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Diapsida
Clade: Neodiapsida
Family: †Younginidae
Broom, 1914

Younginidae is an extinct family of diapsid reptiles from the Late Permian and Early Triassic. In a phylogenetic context, younginids are near the base of the clade Neodiapsida. Younginidae includes the species Youngina capensis from the Late Permian of South Africa and Thadeosaurus colcanapi from the Late Permian and Early Triassic of Madagascar. Heleosuchus griesbachi from the Late Permian of South Africa may also be a member of the family.

Younginidae was traditionally assigned to Eosuchia, an order containing an assemblage of basal diapsids now thought to represent an evolutionary grade rather than a true clade. In 1945 paleontologist Alfred Romer reclassified Younginidae within a new group, Younginiformes, grouping it with the families Tangasauridae and Prolacertidae. Romer considered Younginidae to include many genera that are no longer classified as younginids: Paliguana, Palaegama, and Saurosternon are now considered basal lepidosauromorphs, Galesphyrus and Heleosuchus are diapsids of uncertain affinities (incertae sedis), Heleophilus is now a millerettid, and Heleosaurus is now thought to be a varanopid synapsid.[1][2] Like Eosuchia, Younginiformes is no longer considered valid; for example, the phylogenetic analysis of Reisz et al. place younginids close to Sauria, the clade including the still-living archosauromorph and lepidosauromorph reptiles, while the younginiform family Tangasauridae takes a more basal position in Neodiapsida.[3] Below is a cladogram from that analysis:[3]

Captorhinidae

Diapsida

Araeoscelidia

Neodiapsida

Orovenator

Lanthanolania

Tangasauridae

Tangasaurus

Acerosodontosaurus

Hovasaurus

Younginidae

Thadeosaurus

Youngina

Claudiosaurus

Sauria

Archosauromorpha

Lepidosauromorpha

  1. ^ Laurin, M.; Reisz, R.R. (1995). "A reevaluation of early amniote phylogeny" (PDF). Zoological Journal of the Linnean Society. 113 (2): 165–223. doi:10.1111/j.1096-3642.1995.tb00932.x. Archived from the original (PDF) on 2020-04-13. Retrieved 2012-05-18.
  2. ^ Reisz, R.R.; Modesto, S.P. (2007). "Heleosaurus scholtzi from the Permian of South Africa: a varanopid synapsid, not a diapsid reptile". Journal of Vertebrate Paleontology. 27 (3): 734–739. doi:10.1671/0272-4634(2007)27[734:HSFTPO]2.0.CO;2. S2CID 86246959.
  3. ^ a b 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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Younginidae

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Younginidae is an extinct family of diapsid reptiles from the Late Permian and Early Triassic. In a phylogenetic context, younginids are near the base...

Word Count : 349

Youngina

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Beds of South Africa. This, and a few related forms, make up the family Younginidae, within the order Eosuchia (proposed by Broom in 1914). Eosuchia, having...

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Younginiformes

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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...

Word Count : 485

Neodiapsida

Last Update:

†Saurosternon †Younginiformes (possibly paraphyletic) †Tangasauridae †Younginidae †Avicephala (possibly non-monophyletic) †Drepanosauromorpha †Weigeltisauridae...

Word Count : 1020

Sauropsida

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 2759

Eosuchia

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of South Africa. This and a couple of other genera make up the family Younginidae. The tangasaurids, a family that includes forms apparently adapted for...

Word Count : 316

Diapsid

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  †Younginidae...

Word Count : 958

Archelosauria

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 946

Millerettidae

Last Update:

†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 99

Parareptilia

Last Update:

†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 2809

Anapsid

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 1607

Kuehneosauridae

Last Update:

†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 516

Varanopidae

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 1492

Eureptilia

Last Update:

†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 467

Araeoscelidia

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 986

Orovenator

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Younginidae...

Word Count : 366

List of Permian tetrapods

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Heleosauridae Order Younginiformes Family Acerosodontosaurus Family Younginidae Family Tangasauridae Family Galesphyridae Infraclass Lepidosauromorpha...

Word Count : 417

Mesosaurus

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 1851

Askeptosauridae

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 645

Longisquama

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 1865

Brazilosaurus

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 117

Coelurosauravus

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 1424

Karutia

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 85

Eunotosaurus

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 2213

Mesosaur

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 2262

Kuehneosaurus

Last Update:

†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 425

Heleosaurus

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Galechirus scholtzi. Later work placed it as an Eosuchian in the family Younginidae and even proposed as an ancestor for Archosauria. More recent work has...

Word Count : 1799

Protorothyrididae

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 427

Acleistorhinidae

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†Maiothisavros †Orovenator †Palacrodon †Palaeagama †Saurosternon †Sphodrosaurus †Younginidae Galesphyrus Thadeosaurus Youngina †Tangasauridae Acerosodontosaurus?...

Word Count : 695

Thadeosaurus

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Thadeosaurus is an extinct genus of diapsid reptile belonging to the family Younginidae. Fossils have been found in the Lower Sakamena Formation (Sakamena Group)...

Word Count : 245
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