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A revision of Sanpasaurus yaoi Young, 1944 from the Early Jurassic of China, and its relevance to the early evolution of Sauropoda (Dinosauria).
PeerJ. 2016; 4:e2578.P

Abstract

The Early Jurassic of China has long been recognized for its diverse array of sauropodomorph dinosaurs. However, the contribution of this record to our understanding of early sauropod evolution is complicated by a dearth of information on important transitional taxa. We present a revision of the poorly known taxon Sanpasaurus yaoi Young, 1944 from the late Early Jurassic Ziliujing Formation of Sichuan Province, southwest China. Initially described as the remains of an ornithopod ornithischian, we demonstrate that the material catalogued as IVPP V156 is unambiguously referable to Sauropoda. Although represented by multiple individuals of equivocal association, Sanpasaurus is nonetheless diagnosable with respect to an autapomorphic feature of the holotypic dorsal vertebral series. Additional material thought to be collected from the type locality is tentatively referred to Sanpasaurus. If correctly attributed, a second autapomorphy is present in a referred humerus. The presence of a dorsoventrally compressed pedal ungual in Sanpasaurus is of particular interest, with taxa possessing this typically 'vulcanodontid' character exhibiting a much broader geographic distribution than previously thought. Furthermore, the association of this trait with other features of Sanpasaurus that are broadly characteristic of basal eusauropods underscores the mosaic nature of the early sauropod-eusauropod transition. Our revision of Sanpasaurus has palaeobiogeographic implications for Early Jurassic sauropods, with evidence that the group maintained a cosmopolitan Pangaean distribution.

Authors+Show Affiliations

Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, Gauteng, South Africa; School of Geosciences, University of the Witwatersrand, Johannesburg, Gauteng, South Africa.Department of Earth Sciences, University College London , London , United Kingdom.Department of Earth Science and Engineering, Imperial College London , London , United Kingdom.Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences , Beijing , China.Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, Gauteng, South Africa; School of Geography, Earth & Environmental Sciences, University of Birmingham, Birmingham, United Kingdom.Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, Gauteng, South Africa; Department of Earth Sciences, Natural History Museum, London, United Kingdom.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27781168

Citation

McPhee, Blair W., et al. "A Revision of Sanpasaurus Yaoi Young, 1944 From the Early Jurassic of China, and Its Relevance to the Early Evolution of Sauropoda (Dinosauria)." PeerJ, vol. 4, 2016, pp. e2578.
McPhee BW, Upchurch P, Mannion PD, et al. A revision of Sanpasaurus yaoi Young, 1944 from the Early Jurassic of China, and its relevance to the early evolution of Sauropoda (Dinosauria). PeerJ. 2016;4:e2578.
McPhee, B. W., Upchurch, P., Mannion, P. D., Sullivan, C., Butler, R. J., & Barrett, P. M. (2016). A revision of Sanpasaurus yaoi Young, 1944 from the Early Jurassic of China, and its relevance to the early evolution of Sauropoda (Dinosauria). PeerJ, 4, e2578.
McPhee BW, et al. A Revision of Sanpasaurus Yaoi Young, 1944 From the Early Jurassic of China, and Its Relevance to the Early Evolution of Sauropoda (Dinosauria). PeerJ. 2016;4:e2578. PubMed PMID: 27781168.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A revision of Sanpasaurus yaoi Young, 1944 from the Early Jurassic of China, and its relevance to the early evolution of Sauropoda (Dinosauria). AU - McPhee,Blair W, AU - Upchurch,Paul, AU - Mannion,Philip D, AU - Sullivan,Corwin, AU - Butler,Richard J, AU - Barrett,Paul M, Y1 - 2016/10/20/ PY - 2016/08/02/received PY - 2016/09/16/accepted PY - 2016/10/27/pubmed PY - 2016/10/27/medline PY - 2016/10/27/entrez KW - China KW - Early Jurassic KW - Eusauropoda KW - Middle Jurassic KW - Sauropoda KW - ‘Vulcanodontidae’ SP - e2578 EP - e2578 JF - PeerJ JO - PeerJ VL - 4 N2 - The Early Jurassic of China has long been recognized for its diverse array of sauropodomorph dinosaurs. However, the contribution of this record to our understanding of early sauropod evolution is complicated by a dearth of information on important transitional taxa. We present a revision of the poorly known taxon Sanpasaurus yaoi Young, 1944 from the late Early Jurassic Ziliujing Formation of Sichuan Province, southwest China. Initially described as the remains of an ornithopod ornithischian, we demonstrate that the material catalogued as IVPP V156 is unambiguously referable to Sauropoda. Although represented by multiple individuals of equivocal association, Sanpasaurus is nonetheless diagnosable with respect to an autapomorphic feature of the holotypic dorsal vertebral series. Additional material thought to be collected from the type locality is tentatively referred to Sanpasaurus. If correctly attributed, a second autapomorphy is present in a referred humerus. The presence of a dorsoventrally compressed pedal ungual in Sanpasaurus is of particular interest, with taxa possessing this typically 'vulcanodontid' character exhibiting a much broader geographic distribution than previously thought. Furthermore, the association of this trait with other features of Sanpasaurus that are broadly characteristic of basal eusauropods underscores the mosaic nature of the early sauropod-eusauropod transition. Our revision of Sanpasaurus has palaeobiogeographic implications for Early Jurassic sauropods, with evidence that the group maintained a cosmopolitan Pangaean distribution. SN - 2167-8359 UR - https://www.unboundmedicine.com/medline/citation/27781168/A_revision_of_Sanpasaurus_yaoi_Young_1944_from_the_Early_Jurassic_of_China_and_its_relevance_to_the_early_evolution_of_Sauropoda__Dinosauria__ L2 - https://doi.org/10.7717/peerj.2578 DB - PRIME DP - Unbound Medicine ER -
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