内蒙古二连盆地沙拉木伦地区中始新世全脊貘(Teleolophus)(奇蹄目:貘超科)头后骨骼研究
Postcranial morphology of Middle Eocene deperetellid Teleolophus (Perissodactyla, Tapiroidea) from the Shara Murun region of the Erlian Basin, Nei Mongol, China
摘要
Abstract
Deperetellidae are a group of common,endemic Asian Middle Eocene tapiroids.Although five genera within the family have been named,most of them were represented by fragmentary maxillae and mandibles except for some skeletal material of Deperetella.Based exclusively on dental characters,different authors have proposed affinities of deperetellids with,for instance,helaletid Colodon,lophialetids,or rhodopagids.Here we described the partial postcranial skeleton of Teleolophus medius? recently discovered at Wulanhuxiu (=Ulan Shireh) of the Erlian Basin,China,and compared the postcranial skeletons of Teleolophus with those of Lophialetes,Deperetella,Heptodon,Helaletes,and Colodon.The postcranial skeleton of Teleolophus shares many similarities with that of Deperetella especially in having elongated and slender limbs,a relatively long,narrow lunar with a slightly concave medial border of the radial facet,a magnum with an anteriorly situated hump and a deeply excavated Mc IV facet,a slightly asymmetric trochlea of the femur,a fibula highly reduced or even fused with a tibia,Mt Ⅲ contacting the cuboid,Mt Ⅱ in contact with ectocuneiform only on the posterior end,and the pes with functional tridactyls.These similarities support the close relationship between Teleolophus and Deperetella.We interpreted some similarities of postcrania between Teleolophus and Lophialetes as a result of parallel evolution,due to their cursorial adaptations.Colodon is more similar to Heptodon than to Teleolophus in the postcranial features,suggesting a close relationship between Colodon and Heptodon.Whether or not Helaletidae and Deperetellidae are closely related await further investigation.Both morphological characters and ternary diagram indicate that Teleolophus adapted to fast running,as its contemporary Lophialetes.关键词
内蒙古二连盆地/中始新世/貘超科/全脊貘/头后骨骼/中亚考察团Key words
Erlian Basin,Nei Mongol/Middle Eocene/Tapiroidea,Teleolophus/postcranial skeleton/CAE分类
生物科学引用本文复制引用
白滨,王元青,孟津..内蒙古二连盆地沙拉木伦地区中始新世全脊貘(Teleolophus)(奇蹄目:貘超科)头后骨骼研究[J].古脊椎动物学报,2018,56(3):193-215,23.基金项目
中国科学院战略性先导科技专项(B类)(编号:XDB 26000000)、国家自然科学基金(批准号:41672014,41572021)、中国科学院青年创新促进会(编号:2017101)、现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)(编号:163101)和美国自然历史博物馆古生物部Frick基金资助.We thank Li Qian,Jin Xun,Mao Fang-Yuang,Wang Hai-Bing,Gong Yan-Xin,Zhou Wei,Li Shi-Jie,Li Qi,Wang Yong-Xing,Wang Yong-Fu,Wang Ping,Chen Wei,Li Ping,and Li Qiang (all IVPP) for assistance in the field （B类）
Li Shi-Jie,Li Qi,and Wang Yong-Xing for preparation of specimens （）
Gao Wei and Xu Yong (both IVPP) for the photographs and drawings,respectively.We appreciate Z.J.Tseng (University at Buffalo,State University of New York) for improving the English text and commenting on the manuscript.We thank Zhang Zhao-Qun,Deng Tao,and editor Shi Li-Qun (all IVPP) for the comments and suggestions.Funding was provided by grants from the Strategic Priority Research Program of Chinese Academy of Sciences (XDB26000000),China Scholarship Council,Frick Funds from the Division of Paleontology,American Museum of Natural History,the National Natural Science Foundation of China (41672014,41572021),the Special Fund for Fossil Excavation and Preparation,CAS,State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology,CAS) (No.163103),and Youth Innovation Promotion Association CAS. （both IVPP）
