Osteology and phylogeny of Robustichthys luopingensis, the largest holostean fish in the Middle Triassic

doi:10.7717/peerj.7184

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	Osteology and phylogeny of Robustichthys luopingensis, the largest holostean fish in the Middle Triassic
	Xu, Guang-Hui1,2
刊名	PEERJ
	2019-06-24
卷号	7 期号:0 页码:34
关键词	Fossils Holostei Halecomorphi Ionoscopiformes Evolution
ISSN号	2167-8359
DOI	10.7717/peerj.7184
英文摘要	The extinct ray-finned fish taxon Robustichthys luopingensis from Luoping, eastern Yunnan, China represents the largest holostean known in the Middle Triassic. Despite its potential significance for investigating the holostean phylogeny and reconstructing the Triassic marine ecosystems, Robustichthys has so far not been described in detail and its phylogenetic position within the Holostei was controversy. This study provides a redescription and revision of Robustichthys based upon a comparative study of eight type specimens and nine new specimens. Newly recognized information includes a toothed parasphenoid, a pair of premaxillae not pierced by the olfactory nerve, a splint-like quadratojugal, a hatchet-shaped hyomandibula, an hourglass-shaped symplectic, anterior and posterior ceratohyals, a complete series of branchiostegal rays, and sclerotic bones. A revised reconstruction of Robustichthys is presented. Results of a cladistic analysis confirmed Robustichthys as an ionoscopiform within the Halecomorphi; the previous placements of Robustichthys as a basal ginglymodian and Ionoscopidae as a basal amiiform clade are not supported. The sister group relationship between Sinamiinae (Sinamia and Ikechaoamia) and Amiinae (Amia and Cyclurus) within the Amiidae is newly recognized. This revised topology provides new insights into the evolution and historical paleoecology of halecomorph fishes.
资助项目	National Natural Science Foundation of China (NSFC)[41672001] ; National Natural Science Foundation of China (NSFC)[41688103] ; Key Research Program of Frontier Sciences of Chinese Academy of Sciences[QYZDB-SSW-DQC040] ; Funds for Paleontology Fieldwork and Fossil Preparation, Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences[XDB 26000000] ; Strategic Priority Research Program (B) of Chinese Academy of Sciences[18000000] ; National Natural Science Foundation of China (NSFC)[41472019]
WOS关键词	STEM-NEOPTERYGIAN FISH ; YUNNAN PROVINCE ; TIME-SCALE ; SP NOV. ; HALECOMORPHI ; ACTINOPTERYGII ; CHINA ; INTERRELATIONSHIPS ; GUIZHOU ; GENUS
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	PEERJ INC
WOS记录号	WOS:000472594500004
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/10005]
专题	古脊椎动物与古人类研究所_图书馆1
通讯作者	Xu, Guang-Hui
作者单位	1.CAS Ctr Excellence Life & Paleoenvironm, Beijing, Peoples R China 2.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Xu, Guang-Hui. Osteology and phylogeny of Robustichthys luopingensis, the largest holostean fish in the Middle Triassic[J]. PEERJ,2019,7(0):34.
APA	Xu, Guang-Hui.(2019).Osteology and phylogeny of Robustichthys luopingensis, the largest holostean fish in the Middle Triassic.PEERJ,7(0),34.
MLA	Xu, Guang-Hui."Osteology and phylogeny of Robustichthys luopingensis, the largest holostean fish in the Middle Triassic".PEERJ 7.0(2019):34.