Temporal range:
Skull of Orovenator, the earliest known neodiapsid
Skeleton of Megalancosaurus, a drepanosaur
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Diapsida
Clade: Neodiapsida
Benton, 1985
Subgroups and genera

Neodiapsida is a clade, or major branch, of the reptilian family tree, typically defined as including all diapsids apart from some early primitive types known as the araeoscelidians. Modern reptiles and birds belong to the neodiapsid subclade Sauria.

The oldest known neodiapsid is generally considered to be Orovenator from the Early Permian of North America, around 290 million years old.[1]

Basal-non saurian neodiaspids were ancestrally lizard-like, but basal non-saurian neodiapsids also include specialised swimming forms (Hovasaurus)[2] the gliding lizard-like Weigeltisauridae,[3] as well as the Triassic chameleon-like drepanosaurs.[4] The position of the highly derived Mesozoic marine reptile groups Thalattosauria, Ichthyosauromorpha and Sauropterygia within Neodiapsida is uncertain, and they may lie within Sauria.[5]

  1. ^ Ford, David P.; Benson, Roger B. J. (May 2019). Mannion, Philip (ed.). "A redescription of Orovenator mayorum (Sauropsida, Diapsida) using high‐resolution μ CT , and the consequences for early amniote phylogeny". Papers in Palaeontology. 5 (2): 197–239. doi:10.1002/spp2.1236. ISSN 2056-2802. S2CID 92485505.
  2. ^ Nuñez Demarco, Pablo; Meneghel, Melitta; Laurin, Michel; Piñeiro, Graciela (2018-07-27). "Was Mesosaurus a Fully Aquatic Reptile?". Frontiers in Ecology and Evolution. 6: 109. doi:10.3389/fevo.2018.00109. ISSN 2296-701X.
  3. ^ Pritchard, Adam C.; Sues, Hans-Dieter; Scott, Diane; Reisz, Robert R. (2021-05-20). "Osteology, relationships and functional morphology of Weigeltisaurus jaekeli (Diapsida, Weigeltisauridae) based on a complete skeleton from the Upper Permian Kupferschiefer of Germany". PeerJ. 9: e11413. doi:10.7717/peerj.11413. ISSN 2167-8359. PMC 8141288. PMID 34055483.
  4. ^ Pritchard, Adam C.; Nesbitt, Sterling J. (October 2017). "A bird-like skull in a Triassic diapsid reptile increases heterogeneity of the morphological and phylogenetic radiation of Diapsida". Royal Society Open Science. 4 (10): 170499. Bibcode:2017RSOS....470499P. doi:10.1098/rsos.170499. ISSN 2054-5703. PMC 5666248. PMID 29134065.
  5. ^ 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.

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