中文摘要：

海洋的 nanoplanktonic 硅藻也经常被低估了或由于他们的小尺寸(2 20 μm ) 在浮游植物调查俯看，它允许他们中的大多数通过 70-μm 毛孔尺寸的一张常规浮游植物网。为 nanoplanktonic 硅藻分类，水样品(每 2000 mL ) 从 2002 年 5 月从中国海岸的几个代表性的海区域被收集到 2006 年 5 月。佩拉戈迪克蒂恩·克拉克在传播电子显微镜(TEM ) 下面为中国作为一个最新记录的 nanodiatom 类被识别。这个类被阀门脸的精细的结构描绘。striae 被看见被肋骨形成与跨肋骨(烦恼) 并且干涉空格被多角形的 cribra 占据位于很关门当着阀门的外面的面。就一种被发现，即， P。tenue 克拉克。对有这种和它的生态的产地和分布的 TEM 相片的分类特征的详细描述在这篇论文被给。在几个类似于的类之中的词法特征比较被讨论。

英文摘要：

Marine nanoplanktonic diatoms have been frequently either underestimated or overlooked in phytoplankton investigations due to their small size （2-20μm）, which allows most of them to pass through a regular phytoplankton net of 70μm pore size. For nanoplanktonic diatom classification, water samples （each 2000 mL） were collected from several representative sea areas of Chinese coast from May 2002 to May 2006. Pelagodictyon Clarke was identified as a newly recorded nanodiatom genus for China under transmission electron microscope （TEM）. This genus is characterized by the delicate structure of the valve face. The striae are seen to be formed by ribs with cross-ribs （frets） and the intervening spaces are occupied by polygonal cribra situated much close to the exterior face of the valve. Just one species was found, i.e., P. tenue Clarke. Detailed description of the taxonomic characteristics with TEM photographs of this species and its ecological habitat and distribution are given in this paper. Morphological characteristics comparisons among several resembling genera were discussed.