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Vertebrata Palasiatica ›› 2023, Vol. 61 ›› Issue (3): 161-181.DOI: 10.19615/j.cnki.2096-9899.230703

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Taxonomic revision of Sinoeugnathus kueichowensis (Halecomorphi, Holostei) from the Middle Triassic of Guizhou and Yunnan, China

FENG Dong-Hao1,2, XU Guang-Hui1,*(), MA Xin-Ying3, REN Yi1,2   

  1. 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 University of Chinese Academy of Sciences Beijing 100049
    3 Research Center of Natural History and Culture, Qujing Normal University Qujing, Yunnan 655000
  • Received:2023-03-22 Online:2023-07-20 Published:2023-07-25

云贵地区中三叠世近鲱形类贵州中华真颌鱼(Sinoeugnathus kueichowensis)的分类学修订

冯东昊1,2, 徐光辉1,*(), 马昕莹3, 任艺1,2   

  1. 1 中国科学院古脊椎动物与古人类研究所,中国科学院脊椎动物演化与人类起源重点实验室 北京 100044
    2 中国科学院大学 北京 100049
    3 曲靖师范学院自然历史与文化研究中心 云南曲靖 655000
  • 通讯作者: * xuguanghui@ivpp.ac.cn
  • 基金资助:


The previously alleged ‘eugnathid amiiform’ Sinoeugnathus kueichowensis is a small-sized halecomorph from the Middle Triassic (Ladinian) marine deposits of Guizhou and Yunnan, China. A morphological redescription and taxonomic revision of this taxon are provided based on a detailed examination of the holotype and 15 new specimens. Studies of these specimens revealed some morphological details previously undescribed or misidentified for this taxon, including a hatchet-shaped antorbital, two broad suborbitals, a sensory canal in the maxilla, and three pairs of extrascapulars. For the first time, Sinoeugnathus was incorporated into an analysis of halecomorph phylogeny, and the results recover it as the sister taxon of the Anisian Subortichthys from Luoping, Yunnan, and both are grouped with two Ladinian genera Allolepidotus and Eoeugnathus from the Monte San Giorgio area into a monophyletic group (namely Subortichthyidae fam. nov. herein) at the base of Ionoscopiformes. This taxonomic reassessment of Subortichthys provides new insights into the phylogeny and paleogeographic evolution of Ionoscopiformes.

Key words: Guizhou and Yunnan, Middle Triassic, Ionoscopiformes, Halecomorphi, osteology, phylogeny


小型近鲱形类(Halecomorphi)贵州中华真颌鱼(Sinoeugnathus kueichowensis)发现于中国云贵地区中三叠世拉丁期海相地层中,曾被归入弓鳍鱼目(Amiiformes)真颌鱼科(Eugnathidae)。基于模式标本和15块新标本的详细观察,对该属种进行了重新描述和分类学修订。对这些标本的研究揭示了该属种在早前研究中一些未被描述或识别错误的形态特征,包括斧状的眶前骨,两个宽大的次眶骨,上颌骨具有感觉管和三对额外肩胛骨。首次将中华真颌鱼纳入近鲱形类分支系统学研究中;结果显示,中华真颌鱼与云南罗平安尼期的复兴鱼(Subortichthys)构成姐妹群,两者与欧洲圣乔治山地区拉丁期的Allolepidotus和始真颌鱼(Eoeugnathus)一起组成预言鱼目(Ionoscopiformes)底部的一个单系群(命名为复兴鱼科)。中华真颌鱼的分类学修订为了解预言鱼目的系统发育关系和古地理演化提供了新的信息。

关键词: 云贵地区, 中三叠世, 近鲱形类, 预言鱼目, 骨骼学, 系统发育

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