A streamlined jawless fish (Galeaspida) from the Lower Devonian of Yunnan, China and its taxonomic and paleoecological implications

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	A streamlined jawless fish (Galeaspida) from the Lower Devonian of Yunnan, China and its taxonomic and paleoecological implications
	Gai Zhikun; Zhu Min; Jia Liantao; Zhao Wenjin
	2015
发表期刊	古脊椎动物学报
ISSN	1000-3118
卷号	53 期号:2 页码:93-109
摘要	A new genus and species of the Huananaspiformes (Galeaspida), Rhegmaspis xiphoidea,is described from the Posongchong Formation (Pragian, Early Devonian), Zhaotong, Yunnan Province, China. The new taxon is characterized by having a torpedo-shaped headshield, a long rostral process, ventrolaterally set orbits, and ventrally curved branchial fossae, but no corners, inner corners, and ventral rim of head-shield. It is assigned to the family Gantarostrataspidae that include Gantarostrataspis and Wumengshanaspis. According to the new material and new observation, the Gantarostrataspidae is emended and a fresh look is prososed for Gantarostrataspis and Wumengshanaspis. As a streamlined jawless fish, Rhegmaspis displays an adaptation for a suprabenthic lifestyle with more active feeding behavior among galeaspids. The new form not only enriches the diversity of the Huananaspiformes, but also provides evidence for the last adaptive radiation of galeaspids by occupying an unexploited ecological niche during the Pragian of the Early Devonian.
语种	英语
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/13576
专题	中国科学院古脊椎动物与古人类研究所中科院古脊椎所（2000年以后）
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	Gai Zhikun,Zhu Min,Jia Liantao,et al. A streamlined jawless fish (Galeaspida) from the Lower Devonian of Yunnan, China and its taxonomic and paleoecological implications[J]. 古脊椎动物学报,2015,53(2):93-109.
APA	Gai Zhikun,Zhu Min,Jia Liantao,&Zhao Wenjin.(2015).A streamlined jawless fish (Galeaspida) from the Lower Devonian of Yunnan, China and its taxonomic and paleoecological implications.古脊椎动物学报,53(2),93-109.
MLA	Gai Zhikun,et al."A streamlined jawless fish (Galeaspida) from the Lower Devonian of Yunnan, China and its taxonomic and paleoecological implications".古脊椎动物学报 53.2(2015):93-109.

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