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
收稿日期: 2023-03-22
网络出版日期: 2023-07-03
基金资助
国家自然科学基金(42172008);国家自然科学基金(42202016);中国科学院战略性先导科技专项(B类)(XDB26000000)
Taxonomic revision of Sinoeugnathus kueichowensis (Halecomorphi, Holostei) from the Middle Triassic of Guizhou and Yunnan, China
Received date: 2023-03-22
Online published: 2023-07-03
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。
冯东昊 , 徐光辉 , 马昕莹 , 任艺 . 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[J]. 古脊椎动物学报, 2023 , 61(3) : 161 -181 . DOI: 10.19615/j.cnki.2096-9899.230703
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
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