Morphological examination and phylogenetic position of the newly recorded heterotrophic brackish dinoflagellate Diplopsalis caspica （Dinophyceae） in freshwater habitat from China  

作　　者：Qi Zhang Hui-Yin Song Zheng-Yu Hu Guo-Xiang Liu 

机构地区：[1]Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China [2]State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China

出　　处：《Journal of Systematics and Evolution》2015年第6期512-519,共8页植物分类学报（英文版）

基　　金：Acknowledgements This work was financially supported by the National Natural Science Foundation of China （Grant Nos.30970501 and 31270252）. We thank the staff at the Research Group of Algae Taxonomy and Resources Utilization, Institute of Hydrobiology, the Chinese Academy of Sciences （IHB, CAS） for helpful suggestions.

摘　　要：A heterotrophic dinoflagellate was identified as Diplopsalis caspica Ostenfeld by morphological characteristics, with the plate formula： Po, x, 3′, 1a, 6″, 4c, 4s, 5″′, 1″″. The newly recorded dinoflagellate was encountered during autumn in the phytoplankton community of Jihongtan Reservoir and some small ponds near the reservoir in Shandong Province, China. The species had been reported only in brackish ecosystems; however, our material fit with D. caspica occurred in freshwater habitat. The phylogenetic relationship of D. caspica was elucidated through small and large subunit ribosomal DNA sequences. In small and large subunit ribosomal DNA phylogenies, all Protoperidiniaceae species, including diplopsalids and Protoperidinium Bergh, could cluster into a monophyletic group. The molecular phylogenies indicated that the genus Diplopsalis would provide a link to the common ancestor of the Peridinium Ehrenberg and the Protoperidinium.A heterotrophic dinoflagellate was identified as Diplopsalis caspica Ostenfeld by morphological characteristics, with the plate formula： Po, x, 3′, 1a, 6″, 4c, 4s, 5″′, 1″″. The newly recorded dinoflagellate was encountered during autumn in the phytoplankton community of Jihongtan Reservoir and some small ponds near the reservoir in Shandong Province, China. The species had been reported only in brackish ecosystems; however, our material fit with D. caspica occurred in freshwater habitat. The phylogenetic relationship of D. caspica was elucidated through small and large subunit ribosomal DNA sequences. In small and large subunit ribosomal DNA phylogenies, all Protoperidiniaceae species, including diplopsalids and Protoperidinium Bergh, could cluster into a monophyletic group. The molecular phylogenies indicated that the genus Diplopsalis would provide a link to the common ancestor of the Peridinium Ehrenberg and the Protoperidinium.

关 键 词：China diplopsalid Diplopsalis caspica freshwater habitat new record phylogeny taxonomy 

分 类 号：Q949.247[生物学—植物学] TV213[水利工程—水文学及水资源]