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Morphology and phylogeny of Chrysogorgia pinniformis *** *** ***.,two golden corals from the Caroline seamounts in the tropical Western Pacific Ocean

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Journal of Oceanology and Limnology 2021年第5期39卷 1767-1789页

作者： Yu XU Zifeng ZHAN Kuidong XU Laboratory of Marine Organism Taxonomy and Phylogeny Shandong Province Key Laboratory of Experimental Marine BiologyInstitute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China University of Chinese Academy of Sciences Beijing 100049China

Two new species of Chrysogorgia Duchassaing&Michelotti,1864 collected from the Caroline seamounts in the tropical Western Pacific Ocean are *** pinniformis *** to Versluys’group C(Squamosae typicae)with only scales in polyp body wall and *** *** characterized by large branches pinnately branched and forming multiple fans with its small branches regularly and quasi-dichotomous branched,and scales and rods present in the polyp mouth *** is most similar to *** Cairns,2007 by the pinnate trait,but differs from the latter by its group C pattern(*** A,Spiculosae)and having sclerites present in the polyp mouth area(***).Chrysogorgia varians *** to the Chrysogorgia group A(Spiculosae)with rods distributed in the polyp body wall and *** is characterized by warty rods and elongated scales in the tentacles,many warts and ridges on the scales,conspicuously toothed margins at the rounded ends in the pinnules,and small rods with ridge-like warts in the polyp mouth *** species was frequent and abundant in the Caroline seamounts during our cruises and its morphological variability in growth period was *** phylogenetic analyses based on mtMutS and 28 S rDNA regions supported the assignment of the new species to the genus ***,the mtMutS marker showed very limited usefulness for species delimitation and inner relationship inference of *** contrast,the 28 S rDNA showed much higher level of genetic variation,and it may be a potential barcode for this *** the 28 S rDNA trees,the two new species clustered ***,compilation of our data showed that 42 of 78(ca.54%)Chrysogorgia species were found in the Indo-West Pacific convergent region,indicating that this area may be a hotspot of deep-water Chrysogorgia species.

关键词： Anthozoa Octocorallia chrysogorgiidae deep sea taxonomy

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