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Darriwilian (Middle Ordovician) new trilobites from the Upper Yangtze Region, South China, and their macroevolutionary and paleobiogeographic implications

Published online by Cambridge University Press:  09 December 2021

Xin Wei Open the ORCID record for Xin Wei [Opens in a new window] ,
Zhi-Qiang Zhou ,
Ren-Bin Zhan ,
Rong-Chang Wu ,
Fang-Yi Gong Open the ORCID record for Fang-Yi Gong [Opens in a new window]  and
Jian-Bo Liu
Xin Wei
Affiliation:
School of Earth and Space Sciences, Peking University, 5 Yiheyuan Road, Beijing 100871, China , Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Science, 39 East Beijing Road, Nanjing 210008, China , ,
Zhi-Qiang Zhou
Affiliation:
Xi'an Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, 438 East Youyi Road, Xi'an 710054, China
Ren-Bin Zhan
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Science, 39 East Beijing Road, Nanjing 210008, China , , University of Chinese Academy of Science, 19 Yuquan Road, Beijing 100049, China
Rong-Chang Wu
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Science, 39 East Beijing Road, Nanjing 210008, China , ,
Fang-Yi Gong
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Science, 39 East Beijing Road, Nanjing 210008, China , , University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, China
Jian-Bo Liu
Affiliation:
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China
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Abstract

Two new genera and six new species of trilobites are systematically documented herein: Sinagnostus mirabilis new genus new species, Yanpingia punctata n. gen. n. sp., Illaenus taoyuanensis n. sp., Panderia striolatus n. sp., Nileus yichongqiaoensis n. sp., and Paratiresias peculiaris n. sp. The materials were collected from the Darriwilian (late Middle Ordovician) strata in the Upper Yangtze Region, South China. Also provided is an emended diagnosis of the genus Paratiresias based on the new species Paratiresias peculiaris, which is the oldest known species of this genus with an extremely narrow (sag. and exsag.) preglabellar field. Those Chinese species previously referred to Nanillaenus are reassigned to Illaenus sensu lato. These trilobites add new data for the Darriwilian trilobite macroevolution and show highly endemic to South China and the faunal exchanges between South China and Tarim, Kazakhstan, Alborz, as well as Sibumasu and North China.

UUID: http://zoobank.org/ec3be9be-b003-4367-910d-7a0ac4edc982

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Journal of Paleontology , Volume 96 , Issue 2 , March 2022 , pp. 394 - 411
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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