Mesoeucrocodylia is the clade that includes Eusuchia and crocodyliforms formerly placed in the paraphyletic group Mesosuchia. The group appeared during the Early Jurassic, and continues to the present day.
It was long known that Mesosuchia was an evolutionary grade,[1] a hypothesis confirmed by the phylogenetic analysis of Benton and Clark (1988) which demonstrated that Eusuchia (which includes all living crocodylian species) was nested within Mesosuchia. Due to the paraphyly of Mesosuchia, Mesoeucrocodylia was erected to replace Mesosuchia.
Several anatomical characteristics differentiate Mesoeucrocodylia from the other crocodylomorph clades. The frontal bones of the skull are fused together into a single compound element, for example. Mesoeucrocodylians possess something of a secondary palate, formed by the posterior extension of suturedpalatine bones. The otic aperture of the members of this clade is blocked posteriorly by the squamosal bone.[2]
ClassificationEdit
PhylogenyEdit
Below is a cladogram from Fiorelli and Calvo (2007).[3]
^ abWhetstone KN, Whybrow PJ. 1983. A “cursorial” crocodilian from the Triassic of Lesotho (Basutoland), southern Africa. Occasional Papers of the Museum of Natural History. The University of Kansas 106: 1–37.
^Clark, J. M. (1994). Patterns of evolution in Mesozoic Crocodyliformes In N.C. Fraser and H. D. Sues (editors), In the shadow of dinosaurs. Cambridge: Cambridge University Press. pp. 84–97.
^Fiorelli LE, Calvo JO. 2007. The first "protosuchian" (Archosauria: Crocodyliformes) from the Cretaceous (Santonian) of Gondwana. Arquivos do Museu Nacional, Rio de Janeiro65 (4): 417-459.
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mesoeucrocodylia, clade, that, includes, eusuchia, crocodyliforms, formerly, placed, paraphyletic, group, mesosuchia, group, appeared, during, early, jurassic, continues, present, temporal, range, sinemurian, recent, preꞒ, nnotosuchusscientific, classification. Mesoeucrocodylia is the clade that includes Eusuchia and crocodyliforms formerly placed in the paraphyletic group Mesosuchia The group appeared during the Early Jurassic and continues to the present day MesoeucrocodyliaTemporal range Sinemurian Recent 199 0 Ma PreꞒ Ꞓ O S D C P T J K Pg NNotosuchusScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass ReptiliaClade PseudosuchiaClade CrocodylomorphaClade SolidocraniaClade CrocodyliformesClade MesoeucrocodyliaWhetstone and Whybrow 1983 1 Subgroups Dianchungosaurus Induszalim Lusitanisuchus Neuquensuchus Pachycheilosuchus Hsisosuchus Shartegosuchoidea Zosuchus Sichuanosuchus Shantungosuchus Shartegosuchidae Metasuchia Contents 1 Diagnosis 2 Classification 2 1 Phylogeny 3 ReferencesDiagnosis Edit Crocodilaemus robustusIt was long known that Mesosuchia was an evolutionary grade 1 a hypothesis confirmed by the phylogenetic analysis of Benton and Clark 1988 which demonstrated that Eusuchia which includes all living crocodylian species was nested within Mesosuchia Due to the paraphyly of Mesosuchia Mesoeucrocodylia was erected to replace Mesosuchia Several anatomical characteristics differentiate Mesoeucrocodylia from the other crocodylomorph clades The frontal bones of the skull are fused together into a single compound element for example Mesoeucrocodylians possess something of a secondary palate formed by the posterior extension of sutured palatine bones The otic aperture of the members of this clade is blocked posteriorly by the squamosal bone 2 Classification EditPhylogeny Edit Below is a cladogram from Fiorelli and Calvo 2007 3 Mesoeucrocodylia FruitachampsaZosuchusSichuanosuchusShantungosuchusNeuquensuchusHsisosuchus Metasuchia Neosuchia includes Eusuchia PeirosauridaeNotosuchiaReferences Edit a b Whetstone KN Whybrow PJ 1983 A cursorial crocodilian from the Triassic of Lesotho Basutoland southern Africa Occasional Papers of the Museum of Natural History The University of Kansas 106 1 37 Clark J M 1994 Patterns of evolution in Mesozoic Crocodyliformes In N C Fraser and H D Sues editors In the shadow of dinosaurs Cambridge Cambridge University Press pp 84 97 Fiorelli LE Calvo JO 2007 The first protosuchian Archosauria Crocodyliformes from the Cretaceous Santonian of Gondwana Arquivos do Museu Nacional Rio de Janeiro 65 4 417 459 This article about an archosaur is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Mesoeucrocodylia amp oldid 1062513461, wikipedia, wiki, book, books, library,
