中文摘要：

对采自海南岛的淡水硅藻进行了分类学研究,共观察到曲壳类硅藻40个分类单位。其中11个分类单位为中国新记录,分别为岛曲壳藻Achnanthes islandica、阿奇长曲壳藻Achnanthidium archibaldianum、高尔夫长曲壳藻Achnanthidium caledonicum、弯曲长曲壳藻Achnanthidium deflexum、河流长曲壳藻Achnanthidium rivulare、极常见平面藻Planothidium frequentissimum、皮亚夫平面藻Planothidium piaficum、短肋片状藻Platessa brevicostata、胡斯特片状藻Platessa hustedtii、山地片状藻热带变种Platessa montana var.tropica、扁圆卵形藻尖细变种Cocconeis placentula var.acuta。文章对这11个分类单位的形态特征及生境分布特点进行了描述,讨论了同相近种类的区别特征。对片状藻属Platessa的分类特征进行了中文描述。

英文摘要：

Freshwater diatom from Hainan island were studied in this research, and 11 of 40 taxa were identified as newly recorded species of China that include Achnanthes islandica ？strup, Achnanthidium archibaldianum（LangeBertalot in Lange-Bertalot Krammer） Lange-Bertalot, Achnanthidium caledonicum（Lange-Bertalot in Lange-Bertalot Moser） Lange-Bertalot, Achnanthidium deflexum（Reimer） Kingston, Achnanthidium rivulare Potapova Ponader, Planothidium frequentissimum（Lange-Bertalot） Round Bukhtiyarova, Planothidium piaficum（Carter Denny） Wetzel Ector, Platessa brevicostata（Hustedt） Lange-Bertalot in Krammer Lange-Bertalot, Platessa hustedtii（Krasske） Lange-Bertalot in Krammer Lange-Bertalot, Platessa montana var. tropica（Hustedt） Lange-Bertalot in Krammer Lange-Bertalot, Cocconeis placentula var. acuta Meister. Morphological features and distribution pattern of 11 taxa were described and compared with similar species. The morphological description of the genus Platessa was given in Chinese.