The Iguanodontia (the iguanodonts) are a clade of herbivorous dinosaurs that lived from the Middle Jurassic to Late Cretaceous. Some members include Camptosaurus, Dryosaurus, Iguanodon, Tenontosaurus, and the hadrosaurids or "duck-billed dinosaurs". Iguanodontians were one of the first groups of dinosaurs to be found. They are among the best known of the dinosaurs, and were among the most diverse and widespread herbivorous dinosaur groups of the Cretaceous period.[1]
Iguanodontia is often listed as an infraorder within a suborder Ornithopoda, though Benton (2004) lists Ornithopoda as an infraorder and does not rank Iguanodontia. Traditionally, iguanodontians were grouped into the superfamily Iguanodontoidea and family Iguanodontidae. However, phylogenetic studies show that the traditional "iguanodontids" are a paraphyletic grade leading up to the hadrosaurs (duck-billed dinosaurs). Groups like Iguanodontoidea are sometimes still used as unranked clades in the scientific literature, though many traditional "iguanodontids" are now included in the more inclusive group Hadrosauroidea.[citation needed]
Iguanodontia was originally phylogenetically defined, by Paul Sereno, in 1998, as the most inclusive group containing Parasaurolophus walkeri but not Hypsilophodon foxii. Later, in 2005, he amended the definition to include Thescelosaurus neglectus as a secondary external specifier, alongside Hypsilophodon, accounting for the paraphyletic nature of Hypsilophodontidae.[2] A 2017 study which named and described Burianosaurus noted that the type species Iguanodon bernissartensis must be part of the definition, and that the 2005 definition would, in their analysis, include a far larger group than intended (including Marginocephalia). They proposed an entirely new, node-based definition: the last common ancestor of Iguanodon bernissartensis, Dryosaurus altus, Rhabdodon priscus, and Tenontosaurus tilletti.[3] In 2021, Iguanodontia was given a formal definition under the PhyloCode: "The smallest clade containing Dryosaurus altus, Iguanodon bernissartensis, Rhabdodon priscus, and Tenontosaurus tilletti, provided that it does not include Hypsilophodon foxii." Under this revised definition, Iguanodontia is limited to its traditionally included species, and if it were found to include hypsilophodonts, which were not traditionally considered iguanodontians, it would become an invalid grouping.[4]
The cladogram below follows an analysis by Madzia et al. (2017):[3]
^McDonald, A.T.; Kirkland, J.I.; DeBlieux, D.D.; Madsen, S.K.; Cavin, J.; Milner, A.R.C.; Panzarin, L. (2010). Farke, Andrew Allen (ed.). "New Basal Iguanodontians from the Cedar Mountain Formation of Utah and the Evolution of Thumb-Spiked Dinosaurs". PLOS ONE. 5 (11): e14075. Bibcode:2010PLoSO...514075M. doi:10.1371/journal.pone.0014075. PMC2989904. PMID 21124919.
^Sereno, Paul (2005). "Iguanodontia". TaxonSearch. Retrieved July 5, 2018.
^ abMadzia, Daniel; Boyd, Clint A.; Mazuch, Martin (2017). "A basal ornithopod dinosaur from the Cenomanian of the Czech Republic". Journal of Systematic Palaeontology. 16 (11): 967–979. doi:10.1080/14772019.2017.1371258. S2CID 90008574.
^Madzia D, Arbour VM, Boyd CA, Farke AA, Cruzado-Caballero P, Evans DC. 2021. The phylogenetic nomenclature of ornithischian dinosaurs. PeerJ9:e12362 [1]
iguanodontia, iguanodonts, clade, herbivorous, dinosaurs, that, lived, from, middle, jurassic, late, cretaceous, some, members, include, camptosaurus, dryosaurus, iguanodon, tenontosaurus, hadrosaurids, duck, billed, dinosaurs, were, first, groups, dinosaurs, . The Iguanodontia the iguanodonts are a clade of herbivorous dinosaurs that lived from the Middle Jurassic to Late Cretaceous Some members include Camptosaurus Dryosaurus Iguanodon Tenontosaurus and the hadrosaurids or duck billed dinosaurs Iguanodontians were one of the first groups of dinosaurs to be found They are among the best known of the dinosaurs and were among the most diverse and widespread herbivorous dinosaur groups of the Cretaceous period 1 IguanodontiaTemporal range Middle Jurassic Late Cretaceous 164 66 Ma PreꞒ Ꞓ O S D C P T J K Pg NTenontosaurus skeletal mounts at the Sam Noble Oklahoma Museum of Natural HistoryScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClade DinosauriaClade OrnithischiaClade OrnithopodaClade IguanodontiaBaur 1891Subgroups Cumnoria Eucercosaurus Fostoria Napaisaurus Syngonosaurus Tenontosaurus Rhabdodontomorpha Dryomorpha Owenodon Dryosauridae AnkylopollexiaClassification edit nbsp Skeletal mount of Dryosaurus at the Beneski Museum of Natural History nbsp Skeletal mount of Camptosaurus at the Museum of Western Colorado s Dinosaur Journey MuseumIguanodontia is often listed as an infraorder within a suborder Ornithopoda though Benton 2004 lists Ornithopoda as an infraorder and does not rank Iguanodontia Traditionally iguanodontians were grouped into the superfamily Iguanodontoidea and family Iguanodontidae However phylogenetic studies show that the traditional iguanodontids are a paraphyletic grade leading up to the hadrosaurs duck billed dinosaurs Groups like Iguanodontoidea are sometimes still used as unranked clades in the scientific literature though many traditional iguanodontids are now included in the more inclusive group Hadrosauroidea citation needed Iguanodontia was originally phylogenetically defined by Paul Sereno in 1998 as the most inclusive group containing Parasaurolophus walkeri but not Hypsilophodon foxii Later in 2005 he amended the definition to include Thescelosaurus neglectus as a secondary external specifier alongside Hypsilophodon accounting for the paraphyletic nature of Hypsilophodontidae 2 A 2017 study which named and described Burianosaurus noted that the type species Iguanodon bernissartensis must be part of the definition and that the 2005 definition would in their analysis include a far larger group than intended including Marginocephalia They proposed an entirely new node based definition the last common ancestor of Iguanodon bernissartensis Dryosaurus altus Rhabdodon priscus and Tenontosaurus tilletti 3 In 2021 Iguanodontia was given a formal definition under the PhyloCode The smallest clade containing Dryosaurus altus Iguanodon bernissartensis Rhabdodon priscus and Tenontosaurus tilletti provided that it does not include Hypsilophodon foxii Under this revised definition Iguanodontia is limited to its traditionally included species and if it were found to include hypsilophodonts which were not traditionally considered iguanodontians it would become an invalid grouping 4 The cladogram below follows an analysis by Madzia et al 2017 3 Ornithopoda GideonmantelliaElasmariaBurianosaurusIguanodontia Rhabdodontomorpha MuttaburrasaurusRhabdodontidaeTenontosaurusDryomorpha DryosauridaeAnkylopollexia CamptosaurusIguanodonOuranosaurusReferences edit McDonald A T Kirkland J I DeBlieux D D Madsen S K Cavin J Milner A R C Panzarin L 2010 Farke Andrew Allen ed New Basal Iguanodontians from the Cedar Mountain Formation of Utah and the Evolution of Thumb Spiked Dinosaurs PLOS ONE 5 11 e14075 Bibcode 2010PLoSO 514075M doi 10 1371 journal pone 0014075 PMC 2989904 PMID 21124919 Sereno Paul 2005 Iguanodontia TaxonSearch Retrieved July 5 2018 a b Madzia Daniel Boyd Clint A Mazuch Martin 2017 A basal ornithopod dinosaur from the Cenomanian of the Czech Republic Journal of Systematic Palaeontology 16 11 967 979 doi 10 1080 14772019 2017 1371258 S2CID 90008574 Madzia D Arbour VM Boyd CA Farke AA Cruzado Caballero P Evans DC 2021 The phylogenetic nomenclature of ornithischian dinosaurs PeerJ 9 e12362 1 External links edit nbsp Data related to Iguanodontia at WikispeciesPortals nbsp Dinosaurs nbsp Cretaceous Retrieved from https en wikipedia org w index php title Iguanodontia amp oldid 1157124813, wikipedia, wiki, book, books, library,
