Age of Jurassic basal sauropods in Sichuan, China: A reappraisal of basal sauropod evolution

Wang, Jun; Ye, Yong; Pei, Rui; Tian, Yamin; Feng, Chongqin; Zheng, Daran; Chang, Shaohua

doi:10.1130/b31910.1

Cited by 33 publications

(21 citation statements)

References 26 publications

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“…The ages of several Jurassic stratigraphic units from China are in a state of flux (e.g. Xing et al, 2015); for example, Wang et al (2018) recently dated the Shaximiao (=Dashanpu) Formation as Oxfordian, rather than the late Middle Jurassic (Bathonian-Callovian) age that has been the consensus for some time. Although our taxon ages generally represent the latest literature, in this case our ages differ from Wang et al (2018); however, this only potentially affects our outgroup taxon Shunosaurus (and the second most 'basal' taxon, Omeisaurus), and thus has no impact upon our biogeographic results.…”

Section: Taxon Ages and Relationshipsmentioning

confidence: 99%

Taxonomic affinities of the putative titanosaurs from the Late Jurassic Tendaguru Formation of Tanzania: phylogenetic and biogeographic implications for eusauropod dinosaur evolution

Mannion

Upchurch

Schwarz

et al. 2019

Zoological Journal of the Linnean Society

168

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The Late Jurassic Tendaguru Formation of Tanzania, southeastern Africa, records a rich sauropod fauna, including the diplodocoids Dicraeosaurus and Tornieria, and the brachiosaurid titanosauriform Giraffatitan. However, the taxonomic affinities of other sympatric sauropod taxa are poorly understood. Here, we critically reassess and redescribe these problematic taxa, and present the largest phylogenetic analysis for sauropods (117 taxa scored for 542 characters) to explore their placement within Eusauropoda. Janenschia robusta has played a prominent role in discussions of titanosaur origins, with various authors referring at least some remains to Titanosauria, a clade otherwise known only from the Cretaceous. Re-description of the holotype of Janenschia, and all referable remains, supports its validity and placement as a non-neosauropod eusauropod. It forms a clade with Haestasaurus, from the earliest Cretaceous of the UK, and the Middle/Late Jurassic Chinese sauropod Bellusaurus. Phylogenetic analysis and CT scans of the internal pneumatic tissue structure of Australodocus bohetii tentatively support a non-titanosaurian somphospondylan identification, making it the only known pre-Cretaceous representative of that clade. New information on the internal pneumatic tissue structure of the dorsal vertebrae of the enigmatic Tendaguria tanzaniensis, coupled with a full re-description, results in its novel placement as a turiasaur. Tendaguria is the sister taxon of Moabosaurus, from the Early Cretaceous of North America, and is the first turiasaur recognised from Gondwana. A previously referred caudal sequence cannot be assigned to Janenschia and displays several features that indicate a close relationship with Middle-Late Jurassic East Asian mamenchisaurids. It can be diagnosed by six autapomorphies, and we erect the new taxon Wamweracaudia keranjei gen. et sp. nov. The presence of a mamenchisaurid in the Late Jurassic of southern Gondwana indicates an earlier and more widespread diversification of this clade than previously realised, prior to the geographic isolation of East Asia. Our revised phylogenetic dataset sheds light on the evolutionary history of Eusauropoda, including supporting a basal diplodocoid placement for Haplocanthosaurus, and elucidating the interrelationships of rebbachisaurids. The Tendaguru Formation shares representatives of nearly all sauropod lineages with Middle Jurassic-earliest Cretaceous global faunas, but displays a greater range of diversity than any of those faunas considered individually. Biogeographic analysis indicates that the Tendaguru sauropod fauna was assembled as a result of three main phenomena during the late Early and/or Middle Jurassic: (1) invasions from Euramerica (brachiosaurids, turiasaurs); (2) endemism in west Gondwana (dicraeosaurids, diplodocids); and (3) regional extinctions that restricted the ranges of once widespread groups (mamenchisaurids, the Janenschia lineage). Multiple dispersals across the Central Gondwanan Desert are required to explain the distributions ...

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Section: Taxon Ages and Relationshipsmentioning

confidence: 99%

Taxonomic affinities of the putative titanosaurs from the Late Jurassic Tendaguru Formation of Tanzania: phylogenetic and biogeographic implications for eusauropod dinosaur evolution

Mannion

Upchurch

Schwarz

et al. 2019

Zoological Journal of the Linnean Society

168

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“…Shunosaurus lii was found in 1977, named in 1983 and further described in 1988 (Dong et al, 1983;Zhang, 1988). It was found in the Lower Xiashaximiao Formation near Dashanpu, Zigong, China, which was thought to be Bathonian to Oxfordian in age (±168-157 Ma), however, recent redating of the depositional sediments yields a maximum age of 159 ±2 Ma, giving it an Oxfordian age (Wang et al, 2018). It is the most common sauropod from the Xiashaximiao Formation.…”

Section: Systematic Revision Of Middle Jurassic Gondwanan Sauropodsmentioning

confidence: 99%

“…The Mamenchisauridae is a group of Laurasian sauropods with extreme neck elongation, and their remains have been found in China, Thailand, and Mongolia (Suteethorn et al, 2012;Xing et al, 2015). The Mamenchisaurus fauna, unlike the Shunosaurus-Omeisaurus fauna, is Middle Jurassic in age (Wang et al, 2018). Their interrelationships are a work of ongoing progress, as in many eusauropod phylogenies they emerge as more derived than most derived non-neosauropod eusauropods, like Cetiosaurus and Patagosaurus (e.g., Wilson, 2002;Upchurch et al, 2004;Allain & Aquesbi, 2008;Remes et al, 2009).…”

Section: Systematic Revision Of Middle Jurassic Gondwanan Sauropodsmentioning

confidence: 99%

“…Omeisaurus is a generic name for species that include Omeisaurus maoianus, Omeisaurus junghsiensis, and many others. It was found in the Shaximiao Formation of Sichuan Province, China, which was dated to the Bathonian-Callovian (±178-168 Ma), however, like Shunosaurus, it is recently found to be Oxfordian in age (159 ± 2 Ma) (Wang et al, 2018). It was fi rst described in 1939, and more specimens were added to the genus in the 1970's and 1980's, several of them supposedly representing diff erent species.…”

Section: Systematic Revision Of Middle Jurassic Gondwanan Sauropodsmentioning

confidence: 99%

“…Cetiosaurus and Asia (e.g. Shunosaurus) (Zhang, 1988) but they are found in younger sediments of late Middle Jurassic age, or even early Late Jurassic (Wang et al, 2018). By the Late Jurassic boundary (~ 150Ma) all major clades were established (McIntosh, 1990;Upchurch et al, 2004;Barrett & Upchurch, 2005;Wilson, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic analysis of Gondwanan basal eusauropods from the Early-Middle Jurassic of Patagonia, Argentina

Holwerda

Pol

2018

Spanish J. Palaeontol.

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Gondwanan Jurassic non-neosauropod eusauropods are key for the understanding of sauropod evolution, although their phylogenetic interrelationships remain poorly understood. However, following the revision of the holotype of a key taxon from the early Middle Jurassic Cañadón Asfalto Formation Patagonia, Argentina, Patagosaurus fariasi, the phylogenetic affi nities need to be tested with new osteological information gathered during the redescription of the holotype of Patagosaurus. A new phylogeny presented here shows a close affi liation of Patagosaurus with Cetiosaurus from the Middle Jurassic of the UK. The close relationship of Patagosaurus with Barapasaurus, often found in previous phylogenies, was not recovered here. Instead, Patagosaurus is retrieved as more derived than most Early and Middle Jurassic sauropods, although more basal to Mamenchisaurus, Omeisaurus, turiasaurians, and neosauropods. Another sauropod taxon found together with Patagosaurus, Volkheimeria, is retrieved several nodes more basal than the former, which shows, together with evidence of several other sauropod taxa in RESUMEN Los eusaurópodos no neosaurópodos del Jurásico de Gondwana son especies clave para la comprensión de la evolución del clado Sauropoda, aunque sus relaciones fi logenéticas siguen sin estar bien resueltas. Sin embargo, gracias a la revisión del holotipo de uno de los taxones más importantes del Jurásico Medio temprano de la Formación Cañadón Asfalto, Patagosaurus fariasi, bastantes de sus hipótesis fi logenéticas han de ser puestas en duda, basadas en la nueva información osteológica recogida durante la redescripción del holotipo de Patagosaurus. La nueva hipótesis filogenética aquí presentada muestra una relación cercana entre Patagosaurus y Cetiosaurus, del Jurásico Medio del Reino Unido. La cercanía fi logenética de Patagosaurus con Barapasaurus, publicada en numerosos análisis fi logenéticos, no se obtuvo en este nuevo análisis. En este caso, Patagosaurus aparece como un taxón más derivado que la mayoría de saurópodos del Jurásico Medio y Superior, aunque más basal que Mamenchisaurus, Omeisaurus, Turiasauria y Neosauropoda. Otro taxón que se encuentra normalmente emparentado con Patagosaurus, https://doi.org/10.7203/sjp.33.2.13604 HOLWERDA & POLthe Cañadón Asfalto Formation, that a high evolutionary diversity existed in Southwest Gondwana in the early Middle Jurassic, a pattern which is also seen in fossil groups other than sauropods (e.g., theropods).

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Sauropods from the Early Jurassic of South America and the Radiation of Eusauropoda

Pol

Gomez

Holwerda

et al. 2022

Springer Earth System Sciences

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Age of Jurassic basal sauropods in Sichuan, China: A reappraisal of basal sauropod evolution

Cited by 33 publications

References 26 publications

Taxonomic affinities of the putative titanosaurs from the Late Jurassic Tendaguru Formation of Tanzania: phylogenetic and biogeographic implications for eusauropod dinosaur evolution

Taxonomic affinities of the putative titanosaurs from the Late Jurassic Tendaguru Formation of Tanzania: phylogenetic and biogeographic implications for eusauropod dinosaur evolution

Phylogenetic analysis of Gondwanan basal eusauropods from the Early-Middle Jurassic of Patagonia, Argentina

Sauropods from the Early Jurassic of South America and the Radiation of Eusauropoda

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