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New material of Eocene Helaletidae (Perissodactyla, Tapiroidea) from the Irdin Manha Formation of the Erlian Basin, Inner Mongolia, China, and comments on related localities of the Huheboerhe area. (American Museum novitates, no. 3878)

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dc.contributor.author Bai, Bin, 1981-
dc.contributor.author Wang, Yuan-qing.
dc.contributor.author Mao, Fang-yuan.
dc.contributor.author Meng, Jin (Paleontologist)
dc.date.accessioned 2017-04-17T14:57:12Z
dc.date.available 2017-04-17T14:57:12Z
dc.date.issued 2017-04-14
dc.identifier.uri http://hdl.handle.net/2246/6709
dc.description 44 pages : illustrations (some color), maps ; 26 cm. en_US
dc.description.abstract Perissodactyls first appeared at the beginning of the early Eocene and reached their highest diversity, dominating contemporaneous mammalian faunas in species richness during the middle Eocene. Tapiroidea is an important perissodactyl group that includes earliest-Eocene forms, such as Orientolophus as well as extant taxa (such as Tapirus), that preserves numerous plesiomorphic characters. Because tapiroids were widely distributed in North America and Asia in the middle Eocene, they have played an important role in biostratigraphically defining middle Eocene North American Land Mammal Ages (NALMA) and Asian Land Mammal Ages (ALMA), respectively, as well as in biostratigraphic correlation between the two continents. Here we report a new cranial specimen of middle Eocene helaletid Paracolodon fissus and a maxilla of Desmatotherium mongoliense from the middle Eocene Irdin Manha Formation of the Erlian Basin, Inner Mongolia, China. Paracolodon fissus was previously assigned to Desmatotherium, Helaletes, or Colodon, whereas D. mongoliense was assigned to Helaletes or Irdinolophus by different authors. Based on the new material described in this report, we are able to clarify the affinities and phylogenetic position of these species according to morphological comparison and phylogenetic analyses. We maintain the genus Paracolodon for P. inceptus and P. fissus from Asia and reassign mongoliense to Desmatotherium. Fossils of perissodactyls and other groups from the Irdin Manha Formation favor correlation of the Irdinmanhan ALMA with the early and middle Uintan NALMA (Ui1-Ui2). Through our field investigation, we also clarified that the localities "7 miles southwest" and "10 miles southwest" of Camp Margetts, originally used by the American Museum of Natural History's Central Asiatic Expedition (CAE), correspond to the localities currently known as Huheboerhe and Changanboerhe, respectively. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation.ispartofseries American Museum novitates;no.3878.
dc.subject Paracolodon fissus. en_US
dc.subject Desmatotherium mongoliense. en_US
dc.subject Helaletidae. en_US
dc.subject Skull. en_US
dc.subject Maxilla. en_US
dc.subject Tapiroidea. en_US
dc.subject Perissodactyla. en_US
dc.subject Phylogeny. en_US
dc.subject Names, Geographical. en_US
dc.subject Erlani Basin (China) en_US
dc.subject Inner Mongolia (China) en_US
dc.subject China. en_US
dc.subject Central Asiatic Expeditions (1921-1930) en_US
dc.title New material of Eocene Helaletidae (Perissodactyla, Tapiroidea) from the Irdin Manha Formation of the Erlian Basin, Inner Mongolia, China, and comments on related localities of the Huheboerhe area. (American Museum novitates, no. 3878) en_US


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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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