中文摘要：

报道了来自香港吐露港、中国长江口及厦门港的3个属的3种隐藻及1个变种, 即半片藻Hemiselmis sp. Novarino、伸长斜片藻Plagioselmis prolonga Butcher ex Novarino, Lucas ＆ Morrall、伸长斜片藻北方变种Plagioselmis prolonga var. nordica Novarino, Lucas ＆ Morrall、尖尾全沟藻Teleaulax acuta （Butcher） Hill, 并对每个种类的分类特征、生态分布进行描述, 同时提供每个种的光镜和扫描电镜照片。其中, 半片藻属Hemiselmis Parke是中国海区首次记录的属, 而伸长斜片藻Plagioselmis prolonga和尖尾全沟藻Teleaulax acuta可以引发赤潮。

英文摘要：

Three species and one variety of cryptomonad flagellates belonging to three genera were observed with the scanning electron microscope in sea water samples from Tolo Harbor （Hong Kong）, Changjiang River Estuary and Xiamen Harbor. They are Hemiselmis sp. Novarino, Plagioselmis prolonga Butcher ex Novarino, Lucas ＆ MorraU, Plagioselmis prolonga var. nordica Novarino, Lucas ＆ Morrall and Teleaulax acuta （Butcher） Hill. The taxonomic characteristics, ecological habit and distribution of the above species are described and the LM and SEM photographs of the species are also presented. This is the first record of the genus Hemiselmis Parke in the China Sea, and the species Plagioselmis prolonga and Teleaulax acuta have records of producing blooms in the China Sea.