aneweocenecatostomidteleosteicypriniformesfromnortheasternchinaandearlydivergenceofcatostomidae

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	aneweocenecatostomidteleosteicypriniformesfromnortheasternchinaandearlydivergenceofcatostomidae
	LIU Juan; CHANG Meemann
	2009
发表期刊	scienceinchinaseriesdearthsciences
ISSN	1006-9313
卷号	52 期号:2 页码:189
摘要	A new Eocene catostomid genus and species, Plesiomyxocyprinus arratiae, is described from Huadian, Jilin Province, northeastern China. The materials include a nearly complete skeleton, dozens of pharyngeal bones with teeth, and a number of disarticulated bones. The new articulated specimen is large-sized and deep-bodied, with an estimated standard length of ca. 300 mm and body depth of 156 mm or about half of its standard length. The assignment of the fish to the Catostomidae is based on its falciform pharyngeal bone with one row of numerous (more than 50) compressed teeth, and the bone is much smaller than in cyprinids, especially given the size of the fish. The new fish distinguishes itself from all known catostomids (both extinct and extant) in its long anal fin with four unbranched and 17-18 branched rays, and its extremely short caudal peduncle that is only about one fourth of its depth. Plesiomyxocyprinus arratiae resembles the Eocene-Oligocene transpacific-distributed Amyzon in many general skeletal characters. However, it shows a few characters uniquely shared with the Recent catostomid Myxocyprinus asiaticus. Those include a very long dorsal fin with about 50 branched fin rays, the end of dorsal fin rays being close to the caudal fin base, and anal rays stretching posteriorly beyond the base of caudal fin. It is the first fossil catostomid that shows a close relationship to the endemic Myxocyprinus now living in the Yangtze River and Minjiang River, China. The discovery of Plesiomyxocyprinus arratiae, along with two previously described possible catostomid genera Jianghanichthys and Vasnetzovia, may indicate that the divergence of the Catostomidae started much earlier, in the middle Eocene or earlier, on the western side of the Pacific than on its eastern side.
语种	英语
资助项目	[National Natural Science Foundation of China] ; [U. S. National Science Foundation] ; [European Commission]
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/10764
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	LIU Juan,CHANG Meemann. aneweocenecatostomidteleosteicypriniformesfromnortheasternchinaandearlydivergenceofcatostomidae[J]. scienceinchinaseriesdearthsciences,2009,52(2):189.
APA	LIU Juan,&CHANG Meemann.(2009).aneweocenecatostomidteleosteicypriniformesfromnortheasternchinaandearlydivergenceofcatostomidae.scienceinchinaseriesdearthsciences,52(2),189.
MLA	LIU Juan,et al."aneweocenecatostomidteleosteicypriniformesfromnortheasternchinaandearlydivergenceofcatostomidae".scienceinchinaseriesdearthsciences 52.2(2009):189.