panxianichthysimparilisgenetspnovanewionoscopiformhalecomorphifromthemiddletriassicofguizhouchina

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	panxianichthysimparilisgenetspnovanewionoscopiformhalecomorphifromthemiddletriassicofguizhouchina
	Xu Guanghui; Shen Chenchen
	2015
发表期刊	古脊椎动物学报
ISSN	1000-3118
卷号	53 期号:1 页码:1
摘要	The Ionoscopiformes are a fossil lineage of halecomorphs known only from the Mesozoic marine deposits. Because of their close relationships with the Amiiformes, the Ionoscopiformes are phylogenetically important in investigating the early evolution and biogeography of the Halecomorphi. However, fossil evidence of early ionoscopiforms was scarce; until recently, Robustichthys from the Middle Triassic Luoping Biota, eastern Yunnan, China, represents the oldest and only known ionoscopiform in the Triassic. Here we report the discovery of a new ionoscopiform, Panxianichthys imparilis gen. et sp. nov., on the basis of two well preserved specimens from the Middle Triassic Panxian Biota, western Guizhou, China. The discovery documents the second ionoscopiform in the Middle Triassic; although Panxianichthys is slightly younger than Robustichthys, it is significantly older than other members of this group from the Late Jurassic of Europe, and Early Cretaceous of North and South America. Panxianichthys possesses an important synapomorphy of the Ionoscopiformes: a sensory canal in the maxilla, but retains some primitive characters unknown in other ionoscopiforms. Results of our phylogenetic analysis recover Panxianichthys as the most primitive ionoscopiform, and provide new insight on the early evolution of this clade. The interrelationships of the Ionoscopidae have been reassessed; Quetzalichthys is regarded more closely related to Ionoscopus than to Oshunia. In addition, our analysis supports the reassessment of Furo muensteri as an ophiopsid ionoscopiform. The successive discoveries of Robustichthys and Panxianichthys from China indicate that the early diversification of the Ionoscopiformes is more rapid than previously thought.
语种	英语
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/10474
专题	中国科学院古脊椎动物与古人类研究所
作者单位	中国科学院古脊椎动物与古人类研究所
第一作者单位	中国科学院古脊椎动物与古人类研究所
推荐引用方式 GB/T 7714	Xu Guanghui,Shen Chenchen. panxianichthysimparilisgenetspnovanewionoscopiformhalecomorphifromthemiddletriassicofguizhouchina[J]. 古脊椎动物学报,2015,53(1):1.
APA	Xu Guanghui,&Shen Chenchen.(2015).panxianichthysimparilisgenetspnovanewionoscopiformhalecomorphifromthemiddletriassicofguizhouchina.古脊椎动物学报,53(1),1.
MLA	Xu Guanghui,et al."panxianichthysimparilisgenetspnovanewionoscopiformhalecomorphifromthemiddletriassicofguizhouchina".古脊椎动物学报 53.1(2015):1.