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We are grateful to Liu Yuanrun, Li Pingfen, Zhang Chunqiong, Geng Zhaoyang and Qiu Yongling for their assistance in the fieldwork, Zhang Heming for the artistic restoration. This work was supported by the National Natural Science Foundation of China (42130209; 42002015), Youth Innovation Promotion Association CAS (2021070), General Project of Yunnan Provincial Science and Technology Department (202101BA070001-076), Project of Young and Middle-aged Academic and Technical Talents (202405AC350098) and Meemann Chang Academician Workstation in Yunnan Province (202205AF150002). We thank the anonymous referees and Susan Turner (Brisbane) for helpful comments on an earlier draft.

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    Abstract:

    A new species of Bothriolepis (Placodermi, Antiarcha), B. zhujiangyuanensis sp. nov., is described from the Eifelian (Middle Devonian) Shangshuanghe Formation at the Pearl River Source Scenic Area, Qujing, Yunnan Province, southwestern China and is characterized by a broad postpineal plate bearing a straight anterior margin, a premedian plate wider than long, and a weakly developed dorsal median ridge of the trunk shield. As the eighth Bothriolepis taxon in China, B. zhujiangyuanensis sp. nov. provides a wealth of morphological data to clarify the intrageneric interrelationships. Maximum parsimony analysis, using a revised data set of the genus with 76 ingroup taxa and 72 characters, yields a well-resolved consensus tree for Bothriolepis. The phylogenetic result shows a sister-group relationship between B. zhujiangyuanensis and B. babichevi from Kazakhstan, corroborating the biogeographic proximity between the South China and Kazakhstania blocks during the Middle Devonian.

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XIAN Zumin, PAN Zhaohui, WANG Jianhua, JIA Liantao, ZHAO Yingtian, LUO Yanchao, ZHU Min.2025.[J]. Acta Geologica Sinica(),99(1):1-14

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History
  • Received:April 11,2024
  • Revised:June 21,2024
  • Online: February 17,2025
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