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New Material of Schizotheriine Chalicothere (Perissodactyla, Chalicotheriidae) from the Xianshuihe Formation (Early Miocene) of Lanzhou Basin, Northwest China
Swedish Museum of Natural History, Department of Paleobiology. Northwest University.ORCID iD: 0000-0001-7669-7287
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-2268-5824
Northwest University.
Northwest University.
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2022 (English)In: Journal of mammalian evolution, ISSN 1064-7554, E-ISSN 1573-7055, Vol. 29, no 4, p. 877-889Article in journal (Refereed) Published
Abstract [en]

A new schizotheriine mandible from the early Miocene Xianshuihe Formation in Lanzhou Basin, Northwest China is described here. Compared with other contemporaneous taxa, the lower jaw is most similar to Borissiakia betpakdalensis from Kazakhstan based on mandibular morphology and dental features, except for a much smaller body size which is hardly explained by intraspecific variation and suggests it represents a smaller body-sized species of Borissiakia. The type specimen of Phyllotillon huangheensis, from the same strata of the Lanzhou Basin, shares characters with the new specimen in the lower cheek teeth and the tapered morphology of the anterior horizontal ramus. Differences between both are reflected in the height of the ramus, especially the level of the symphysis, which may be an expression of sexual dimorphism. Therefore, schizotheriine mandibles from the early Miocene of Lanzhou Basin are regarded as the same taxon, and both are recognized as Borissiakia huangheensis. The occurrence of a chalicothere and other large perissodactyls may suggest that a certain amount of open woodland was distributed across the basin and that the paleoclimate might have been more humid during the early Miocene.

Place, publisher, year, edition, pages
Berlin: Springer, 2022. Vol. 29, no 4, p. 877-889
Keywords [en]
Chalicotheres, Perissodactyls, Miocene, Neogene, China, dental morphology, systematics
National Category
Natural Sciences Earth and Related Environmental Sciences Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4896DOI: 10.1007/s10914-022-09619-3OAI: oai:DiVA.org:nrm-4896DiVA, id: diva2:1715231
Note

Open access funding provided by Swedish Museum of Natural History. The present research was financially supported by the National Natural Science Foundation of China (NSFC 42172010). ZY L sincerely appreciates the China Scholarship Council (no. 202106970018) for one year of research as a visiting PhD student with TM at the Swedish Museum of Natural History.

Available from: 2022-12-01 Created: 2022-12-01 Last updated: 2022-12-02Bibliographically approved

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