234 Thalassiosira rotula 圓海鏈藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Mediophyceae 纲：中型硅藻綱 Order: Thalassiosirales 目：海鏈藻目 Family: Thalassiosiraceae 科：海鏈藻科 Morphology Cells are discoid and display flat rectangle in girdle view, with a clear boundary between valve mantle and girdle band. Adjacent cells are united by the robust mucilage threads running through the valve center, forming straight or slightly curved chains. Chloroplasts are small and numerous. 形態 細胞圓盤形，殼環面觀扁長方形，細胞壁殼套與殼環帶之間有明顯界限。相鄰細胞 由殼面中央的一條粗膠質線相連成直鏈或略彎的鏈。色素體小而多。 Ecology and distribution Thalassiosira rotula is a cosmopolitan neritic species widely distributed in temperate waters. 生態與分佈 圓海鏈藻是浮游物種，主要分佈在溫帶近岸海域。 Size Diameter (apical axis): 39-51 μm (Chin et al., 1965; Guo et al., 2003); 30-61 μm (Isamu, 1991); 8-55 μm (Tomas, 1997)
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