The Early Triassic eosauropterygian<i>Majiashanosaurus discocoracoidis</i>, gen. et sp. nov. (Reptilia, Sauropterygia), from Chaohu, Anhui Province, People’s Republic of China

Jiang, Da-Yong; Motani, Ryosuke; Tintori, Andrea; Rieppel, Olivier; Chen, Guanbao; Huang, Jian‐Dong; Rong, Zhang; Sun, Zhipeng; Ji, Cheng

doi:10.1080/02724634.2014.846264

Cited by 49 publications

(56 citation statements)

References 21 publications

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“…The phylogenetic framework used in the present study combines information from the datasets of Jiang et al. (; Triassic sauropterygians) and Benson and Druckenmiller (; Jurassic–Cretaceous plesiosaurians). Our topology for Plesiosauria was based on a more inclusive matrix using the character list of Benson and Druckenmiller (), but including more taxa.…”

Section: Methodsmentioning

confidence: 99%

“…We selected 100 of these most parsimonious cladograms at random from the full set of MPTs and combined them with the most recent comprehensive hypotheses of nonplesiosaurian relationships (Jiang et al. ) to generate a set of 100 composite trees, including 139 taxa and spanning the entire evolutionary history of Sauropterygia (Supplementary Information). Adequate trait data were not available for all the taxa included in the phylogeny, we therefore downsampled the number of tips in the tree before analysis, and this procedure removed areas of local phylogenetic uncertainty that are only relevant when a larger sample of taxa is considered.…”

Section: Methodsmentioning

confidence: 99%

“…This high level of variation provides a model system for testing macroevolutionary hypotheses relating to vertebral development and body plan evolution in vertebrates, by quantifying patterns of evolutionary change in body proportions and vertebral counts in the context of a well‐constrained phylogeny (Benson and Druckenmiller ; Jiang et al. ).…”

Section: Developmental and Macroevolutionary Mechanisms Of Axial Orgamentioning

confidence: 99%

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Developmental mechanisms of macroevolutionary change in the tetrapod axis: A case study of Sauropterygia

Soul

Benson

2017

Evolution

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Understanding how developmental processes change on macroevolutionary timescales to generate body plan disparity is fundamental to the study of vertebrate evolution. Adult morphology of the vertebral column directly reflects the mechanisms that generate vertebral counts (somitogenesis) and their regionalisation (homeotic effects) during embryonic development. Sauropterygians were a group of Mesozoic marine reptiles that exhibited an extremely high disparity of presacral vertebral/somite counts. Using phylogenetic comparative methods, we demonstrate that somitogenesis and homeotic effects evolved in a co‐ordinated way among sauropterygians, contrasting with the wider pattern in tetrapods, in which somitogenetic and homeotic shifts are uncorrelated. Changes in sauropterygian body proportions were primarily enabled by homeotic shifts, with a lesser, but important, contribution from differences in postpatterning growth among somites. High body plan plasticity was present in Triassic sauropterygians and was maintained among their Jurassic and Cretaceous descendants. The extreme disparity in the body plan of plesiosaurian sauropterygians did not result from accelerated rates of evolutionary change in neck length, but instead reflect this ancestral versatility of sauropterygian axial development. Our results highlight variation in modes of axial development among tetrapods, and show that heterogeneous statistical models can uncover novel macroevolutionary patterns for animal body plans and the developmental mechanisms that control them.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Developmental and Macroevolutionary Mechanisms Of Axial Orgamentioning

confidence: 99%

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Developmental mechanisms of macroevolutionary change in the tetrapod axis: A case study of Sauropterygia

Soul

Benson

2017

Evolution

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“…Keichousaurus hui and Q. chajiangensis also presents amphicoelous centra, as well as the Chinese taxon Wumengosaurus delicatomandibularis Jiang, Rieppel, Motani, Hao, Sun, Schmitz andSun 2008 (Jiang et al, 2008). Diandongosaurus acutidentatus Shang, Wu and Li 2011, from China, presents rhomboidal neural spines and elongated centra, this last character also being shared with the Chinese eosauropterygians Hanosaurus hupehensis Young 1972, and Majiashanosaurus discocoracoidis Jiang, Motani, Tintori, Rieppel, Chen, Huang, Zhang, Sun andJi 2014 (Rieppel 1998b;Shang et al, 2011;Sato et al, 2014;, but not with UPUAM 14072. In addition, M. discocoracoidis presents laterally constrained centra in ventral view, not consistent with the Fuencaliente de Medinaceli vertebrae.…”

Section: Discussionmentioning

confidence: 99%

First Triassic tetrapod (Sauropterygia, Nothosauridae) from Castilla y León: evidence of an unknown taxon for the Spanish record

Chaves

García‐Gil

Ortega

et al. 2016

Journal of Iberian Geology

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Several vertebrae of a sauropterygian specimen have been recovered in Fuencaliente de Medinaceli (Soria Province, Castilla y León, Spain). The remains come from late Middle Triassic levels (late Ladinian) of the upper Muschelkalk Facies. This finding represents the first documented evidence of a Triassic tetrapod in Castilla y León. The vertebrae belong to Nothosaurus, a sauropterygian genus found in Europe, Middle East, North of Africa and China. This genus is poorly-known in the Iberian record. The new remains constitute the first evidence of the species Nothosaurus giganteus, or a related taxon, in the Iberian Peninsula, being referred as Nothosaurus cf. giganteus. This study reveals the occurrence of at least two species of the sauropterygian Nothosaurus in the Iberian record.

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“…Sauropterygia comprise a successful group of Mesozoic diapsid marine reptiles known from the Early Triassic to the end of the Cretaceous (Storrs ; Bakker ; Jiang et al . ). This clade underwent rapid diversification during the Middle and early Late Triassic, when this group reached its greatest diversity (Rieppel ; Stubbs & Benton ).…”

mentioning

confidence: 97%

A new placodont from the Upper Triassic of Spain provides new insights on the acquisition of the specialized skull of Henodontidae

Chaves

Ortega

Pérez‐García

2018

Papers in Palaeontology

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Henodus chelyops Huene is considered to be a highly autapomorphic cyamodontoid placodont with specialized trophic adaptations relative to all the other members of Placodontia. It has been exclusively found in the Carnian (Upper Triassic) of T€ ubingen (Germany). Here we present a partial skull identified as a new cyamodontoid placodont from the Upper Triassic of El Atance (Guadalajara Province, Spain), Parahenodus atancensis gen. et sp. nov. It is recognized as the sister taxon of H. chelyops, both taxa composing the clade Henodontidae. An emended diagnosis for

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The Early Triassic eosauropterygianMajiashanosaurus discocoracoidis, gen. et sp. nov. (Reptilia, Sauropterygia), from Chaohu, Anhui Province, People’s Republic of China

Cited by 49 publications

References 21 publications

Developmental mechanisms of macroevolutionary change in the tetrapod axis: A case study of Sauropterygia

Developmental mechanisms of macroevolutionary change in the tetrapod axis: A case study of Sauropterygia

First Triassic tetrapod (Sauropterygia, Nothosauridae) from Castilla y León: evidence of an unknown taxon for the Spanish record

A new placodont from the Upper Triassic of Spain provides new insights on the acquisition of the specialized skull of Henodontidae

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