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Revealing body proportions of the enigmatic choristodere reptile Khurendukhosaurus from Mongolia

Matsumoto, R; Tsogtbaatar, K; Ishigaki, S; Tsogtbaatar, C; Enkhtaivan, Z; Evans, SE; (2019) Revealing body proportions of the enigmatic choristodere reptile Khurendukhosaurus from Mongolia. Acta Palaeontologica Polonica , 64 (2) pp. 363-377. 10.4202/app.00561.2018. Green open access

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Abstract

Khurendukhosaurus is an enigmatic genus of choristodere, recorded from the Lower Cretaceous of East Asia, Mongolia, and Siberian Russia. Until now, it was known only from isolated skull and postcranial elements, limiting comparison with other genera. Three major morphotypes have been recognised within Choristodera: longirostrine neochoristoderes with short-necks, and brevirostrine non-neochoristoderes with either short or long necks. The morphotype of Khurendukhosaurus was uncertain, although it had been inferred to be long-necked, based on cervical and caudal vertebral morphology shared with the Chinese Hyphalosaurus and on the results of phylogenetic analysis that placed it within a clade of Sino-Japanese long-necked taxa. Newly discovered material from the Mongolian type locality, Khuren-Dukh, preserves most major postcranial elements of a single individual. This specimen confirms that Khurendukhosaurus belongs to the long-necked morphotype, in having at least 13 cervical vertebrae. Moreover, a new phylogenetic analysis supports the placement of Khurendukhosaurus as a sister group of the Hyphalosaurus + Shokawa clade. Based on the new material, Khurendukhosaurus is estimated to have been roughly 1 m in total length, placing it at the upper end of the size range for long-necked choristoderes.

Type: Article
Title: Revealing body proportions of the enigmatic choristodere reptile Khurendukhosaurus from Mongolia
Open access status: An open access version is available from UCL Discovery
DOI: 10.4202/app.00561.2018
Publisher version: https://doi.org/10.4202/app.00561.2018
Language: English
Additional information: Copyright © 2019 R. Matsumoto et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License (for details please see http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Keywords: Reptilia, Choristodera, Khurendukhosaurus, Cretaceous, Mongolia, Khuren- Dukh
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Cell and Developmental Biology
URI: https://discovery.ucl.ac.uk/id/eprint/10077666
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