Four Newly Recorded Species of Surirellaceae (Bacillariophyta) in China
双菱藻科（硅藻门）——四个中国新纪录种

Four species of Surirellaceae(Bacillariophyta) are first reported in China from Xinjiang and Yunnan Province in this paper,specifically Cymatopleura cochlea Brun,Surirella visurgis Hustedt,Campylodiscus clypeus Ehrenberg and Campylodiscus levanderi Hustedt.The taxonomic characters,light microscopy(LM)and scanning electron microscopy(SEM)photos and ecological affinities were described for each taxon.