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A new genus of galeaspids (jawless stem-Gnathostomata) from the early Silurian Chongqing Lagerstätte, China

  • CHEN Yang ,
  • LI Qiang ,
  • ZHOU Zheng-Da ,
  • SHAN Xian-Ren ,
  • ZHU You-An ,
  • WANG Qian ,
  • WEI Guang-Biao ,
  • ZHU Min
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  • 1 Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Beijing 100044
    2 Chongqing Key Laboratory of Resources and Environment Effects of Major Geological Events, Chongqing Institute of Geology and Mineral Resource Chongqing 401120
    3 University of Chinese Academy of Sciences Beijing 100049
    4 Research Center of Natural History and Culture, Qujing Normal University Qujing, Yunnan 655011
    5 Chongqing Institute of Geological Survey Chongqing 401122

Received date: 2024-05-30

  Online published: 2024-08-20

Abstract

The early Silurian Chongqing Lagerstätte (middle Telychian) yields exceptionally preserved articulated jawless and jawed fishes. Here, we describe a new eugaleaspiform (Galeaspida, jawless stem-Gnathostomata), Miaojiaaspis dichotomus gen. et sp. nov., from the Chongqing Lagerstätte in Xiushan, Chongqing, China. The new form resembles Tujiaaspis vividus in the short medial dorsal canal, and the presence of the branching ends of the lateral transverse canal. They differ in that T. vividus has highly developed subordinate branches of the sensory canals that form a reticulate sensory canal system, and the median dorsal opening is more elongated. Our phylogenetic analysis recovers M. dichotomus and T. vividus as a monophyletic clade (Tujiaaspidae fam. nov.), which is supported by two synapomorphies: the short medial dorsal canal, and the branching ends of the lateral transverse canal. Tujiaaspidae forms a trichotomy with Shuyuidae and a clade comprising Anjiaspis, Sinogaleaspidae, Yongdongaspidae, and the ‘eugaleaspid cluster’. The sensory canal patterns in galeaspids are compared to show the transformation sequence of the sensory canal system in Eugaleaspiformes.

Cite this article

CHEN Yang , LI Qiang , ZHOU Zheng-Da , SHAN Xian-Ren , ZHU You-An , WANG Qian , WEI Guang-Biao , ZHU Min . A new genus of galeaspids (jawless stem-Gnathostomata) from the early Silurian Chongqing Lagerstätte, China[J]. Vertebrata Palasiatica, 2024 , 62(4) : 245 -261 . DOI: 10.19615/j.cnki.2096-9899.240820

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