Guanlingsaurus

Yin et al. 2000

Guanlingsaurus est un genre fossile de grands ichthyosauriens, à corps allongé, appartenant à la famille des Shastasauridae. Il a vécu au Trias supérieur soit il y a environ 235 Ma. Ses fossiles ont été retrouvés en Chine, dans la partie inférieure de la formation géologique de Xiaowa, située dans le xian autonome buyei et miao de Guanling de la province de Guizhou.

Plage temporelle

Trias

Jurassique

Crétacé

Paléogène

Néogène

252 201 145 66 0 Ma

Occurrences PBDB

Groupe

Ichtyosaures

Carnivore nektonic Marin

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Life restoration of the Triassic ichthyosaur Callawayia neoscapularis. Three specimens of this ichthyosaur are known, the holotype, ROM 41993, and two referred specimens, TMP 94.380.11 and 94.382.2. The skull is primarily based on ROM 41993, cross-checked against TMP 94.380.11 and TMP 94.382.2. The vertebral column is based primarily on TMP 94.382.2 as it is the most complete of these specimens, while the ribs were based on ROM 41993. The forelimbs were mainly based on those of ROM 41993, with TMP 94.380.11 used to determine their breadth. The hindlimbs were based on TMP 94.380.11, especially the more complete right hindlimb. ROM 41993 was cross-scaled with TMP 94.380.11 by the dimensions of the forelimb epipodials, which produced similar vertebral dimensions. The two TMP specimens were cross-scaled based on femoral length, also producing similar vertebral dimensions. Nicholls & Manabe (2001) stated that no wedge-shaped caudal centra supporting a tailbend were found and that there was no evidence of a bend being present, though considered that they might have existed in the gap in the preserved caudals. Since various other Triassic ichthyosaurs have since been found to have tail bends, one was illustrated here. A modest downturn of roughly 15° was illustrated, comparable to that in Guanlingsaurus, and the location of the bend within the gap in the preserved vertebrae matches well with the location of the bend in Guizhouichthyosaurus. References McGowan, C. (1994). "A new species of Shastasaurus (Reptilia: Ichthyosauria) from the Triassic of British Columbia: The most complete exemplar of the genus". Journal of Vertebrate Paleontology 14 (2): 168–179. DOI:10.1080/02724634.1994.10011550. Nicholls, E. L.; Manabe, M. (2001). "A new genus of ichthyosaur from the Late Triassic Pardonet Formation of British Columbia: Bridging the Triassic-Jurassic gap". Canadian Journal of Earth Sciences 38 (6): 983–1002. Ji, C.; Jiang, D.Y.; Hao, W.; Sun, Y. (2011). "True tailbend occurred in the Late Triassic: Evidence from ichthyosaur skeletons of South China". Acta Scientiarum Naturalium Universitatis Pekinensis 47 (2): 309–314. Shang, Q. H.; Li, C. (2009). "On the occurrence of the ichthyosaur Shastasaurus in the Guanling biota (Late Triassic), Guizhou, China". Vertebrata PalAsiatica 47 (3): 178–193. © Slate Weasel · CC BY 4.0 · Wikimedia

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Classification

Ichthyosauria Clade non classé

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Hueneosauria Clade non classé

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Merriamosauria Clade non classé

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Shastasauridae Famille

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Guanlingsaurus Genre

Sites de découverte 2 sites géolocalisés

Répartition

Principaux pays

🇨🇳 Chine

Formations géologiques

Wayao

Xiaowa

Distribution temporelle

Carnien (237–227.3 Ma)

Espèces (1)

Guanlingsaurus liangae 237 Ma

Bibliographie

Description originale

C. Ji, D.-Y. Jiang, and R. Motani, W.-C. Hao, Z.-Y. Sun, T. Cai. 2013. A new juvenile specimen of Guanlingasaurus (Ichthyosauria, Shastasauridae) from the Upper Triassic of southwestern China. Journal of Vertebrate Paleontology 33(2):340-348 DOI ↗

Bibliographie (2)

X. Wang, G. H. Bachmann, and H. Hagdorn, P. M. Sanders, G. Cuny, X. Chen, C. Wang, L. Chen, L. Cheng, F. Meng, G. Xu. 2008. The Late Triassic black shales of the Guanling area, Guizhou province, south-west China: a unique marine reptile and pelagic crinoid fossil lagerstätte. Palaeontology 51(1):27-61

Guanlingsaurus

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