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

doi:10.7717/peerj.7184

IVPP-IR > 中科院古脊椎所（2000年以后）

	Osteology and phylogeny of Robustichthys luopingensis, the largest holostean fish in the Middle Triassic
	Xu, Guang-Hui1,2
	2019-06-24
发表期刊	PEERJ
ISSN	2167-8359
卷号	7 期号:0 页码:34
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.
关键词	Fossils Holostei Halecomorphi Ionoscopiformes Evolution
DOI	10.7717/peerj.7184
关键词[WOS]	STEM-NEOPTERYGIAN FISH ; YUNNAN PROVINCE ; TIME-SCALE ; SP NOV. ; HALECOMORPHI ; ACTINOPTERYGII ; CHINA ; INTERRELATIONSHIPS ; GUIZHOU ; GENUS
收录类别	SCI
语种	英语
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研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000472594500004
出版者	PEERJ INC
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/10006
专题	中科院古脊椎所（2000年以后）
通讯作者	Xu, Guang-Hui
作者单位	1.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China 2.CAS Ctr Excellence Life & Paleoenvironm, 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.

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