晚三叠世东特提斯洋龙鱼属(Saurichthys)(Actinopterygii:Saurichthyidae)的首次记录
First record of Saurichthys(Actinopterygii:Saurichthyidae)from the Late Triassic of eastern Paleo-Tethys
摘要
Abstract
The saurichthyiform fishes,characterized by a pointed rostrum and a streamlined long and slender body plan,ranked among the top predators of the ichthyofauna in the Early Mesozoic oceanic ecosystem.In a cosmopolitan pattern,these fishes rapidly radiated after the end-Permian mass extinction(EPME)and diversified morphologically and ecologically during the Middle Triassic.Thereafter,they seemingly showed a notable shrinkage from a global distribution to an occurrence basically restricted to the western Paleo-Tethys realm since the Late Triassic.Specifically,there is no saurichthyiform fossil record so far from the marine Late Triassic of South China(eastern Paleo-Tethys),where contrastingly they were highly diversified in stratigraphically older Lagerstatten(Middle Triassic Panxian-Luoping and Xingyi biotas).Here we report the discovery of Saurichthys taotie sp.nov.from the Guanling biota of Guizhou and Yunnan provinces,southwestern China.This new species is a medium-sized Saurichthys featured by subtriangular subopercles ornamented with densely arranged vertical striae,faint ornamentation on the posterior part of the skull roof,and strong longitudinal ridges decorating the anterodorsal surface of the rostrum.By marking its own group's first occurrence in the Late Triassic of eastern Paleo-Tethyan province,Saurichthys taotie suggests that the saurichthyiform fishes were actually much more widespread than previously thought during that geological stage when they showed a considerable decline in the diversity.By still possessing some features previously only seen in its Early Triassic congeners elsewhere,Saurichthys taotie sheds new light on the evolutionary and paleobiogeographical history of saurichthyiform fishes.关键词
关岭生物群/贵州/云南/东特提斯洋/晚三叠世/龙鱼类Key words
Guanling biota/Guizhou/Yunnan/eastern Paleo-Tethys/Late Triassic/Saurichthys分类
生物科学引用本文复制引用
房庚雨,孙元林,季承,吴飞翔..晚三叠世东特提斯洋龙鱼属(Saurichthys)(Actinopterygii:Saurichthyidae)的首次记录[J].古脊椎动物学报,2023,61(1):1-16,16.基金项目
中国科学院战略性先导科技专项(编号:XDA20070203)、国家自然科学基金(批准号:41472019,41972003)和中国科学院青年创新促进会(编号:2020313)资助.The authors thank Dr.Wang Wei(IVPP)for helpful discussions.Thanks to Prof.Sha Jingeng(NIGPAS)for helping with diagnosing the fossil bivalves.Thanks to Yin Pengfei(IVPP)for conducting the X-ray computed tomography.Thanks also go to Yinmai O'Connor for making some stylistic improvement of the manuscript.The authors appreciate the reviewers,Ilja Kogan and Xu Guanghui,whose comments and suggestions improved the quality of the manuscript.This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(CAS)(Grant No.XDA20070203),National Natural Science Foundation of China(Grant Nos.41472019,41972003)and the Youth Innovation Promotion Association of the CAS to C.J.(2020313). （编号:XDA20070203）
