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Article: A new species of the Cambrian bivalved euarthropod Pectocaris with axially differentiated enditic armatures

Papers in Palaeontology - Volume 7 Issue 1 - Cover
Publication: Palaeontology
Volume: 7
Part: 4
Publication Date: November 2021
Page(s): 1781 1792
Author(s): Changfei Jin, Huijuan Mai, Hong Chen, Yu Liu, Xianguang Hou, Ruilin Wen, and Dayou Zhai
DOI: 10.1002/spp2.1362
Addition Information

How to Cite

JIN, C., MAI, H., CHEN, H., LIU, Y., HOU, X., WEN, R., ZHAI, D. 2021. . Papers in Palaeontology, 7, 4, 1781-1792. DOI: /doi/10.1002/spp2.1362

Author Information

  • Changfei Jin - Yunnan Key Laboratory for Palaeobiology Institute of Palaeontology Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Changfei Jin - MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Huijuan Mai - Yunnan Key Laboratory for Palaeobiology Institute of Palaeontology Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Huijuan Mai - MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Hong Chen - Yunnan Key Laboratory for Palaeobiology Institute of Palaeontology Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Hong Chen - MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Hong Chen - School of Biological Sciences and Technology Liupanshui Normal University Liupanshui Guizhou 553004 China
  • Yu Liu - Yunnan Key Laboratory for Palaeobiology Institute of Palaeontology Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Yu Liu - MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Xianguang Hou - Yunnan Key Laboratory for Palaeobiology Institute of Palaeontology Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Xianguang Hou - MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Ruilin Wen - Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences 19 Beitucheng West Road Chaoyang District Beijing 100029 China
  • Ruilin Wen - CAS Center for Excellence in Life and Paleoenvironment Beijing 100044 China
  • Dayou Zhai - Yunnan Key Laboratory for Palaeobiology Institute of Palaeontology Yunnan University Waihuan South Road Chenggong District Kunming 650500 China
  • Dayou Zhai - MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment Yunnan University Waihuan South Road Chenggong District Kunming 650500 China

Publication History

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    Abstract

    Although first described in 1999, the early Cambrian Pectocaris remains a poorly known euarthropod genus. Two species, Pectocaris eurypetala and P. spatiosa, have been described from the Chengjiang biota. Here, we report a third species, Pectocaris inopinata sp. nov., which bears a pair of stalked eyes attached to an anterior sclerite, a pair of short but stout antennae, 29–35 cephalothoracic segments each corresponding to a pair of biramous appendages, 11–12 limbless segments carrying two rows of ventral spines and one row of dorsal spines, and a pair of broad telson flukes decorated with short marginal spines. Most strikingly, the endopods of anterior trunk appendages are each axially differentiated with two rows of setulose endites proximally and claw-like paired spines distally, in contrast to the endopods of posterior trunk appendages that carry two rows of setulose endites but lack claw-like paired spines. Phylogenetic analysis shows that P. inopinata, the other two Pectocaris species, together with their close relative Jugatacaris agilis belong to the same monophyletic clade. Our study reveals considerable differences in appendicular details and therefore presumably niche differentiation among Pectocaris and Jugatacaris species, as well as some other bivalved euarthropods in the Cambrian with similar overall appearances.

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