225 Thalassiosira eccentrica 離心列海鏈 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 solitary or united in short loose chains by a mucilage thread running through the central strutted process. Frustules are strongly silicified and drum-shaped in girdle view. Valves are circular, flat, and coarsely areolated. The hexagonal areolae are arranged in curved tangential rows (eccentric structure) and slightly decreasing in size towards the margin. The central areola is surrounded by a ring of six to eight (usually seven) areolae. 形態 細胞單獨生活或由殼面中央支持突分泌的膠質絲相連成鬆散短鏈。細胞壁硅質化 較強， 殼環面觀呈鼓形。殼面圓形，平坦，佈滿篩室。篩室六邊形，呈弧形離心 狀排列，大小從中央到邊緣輕微漸小。中央篩室常被6到8個（通常7個）篩室環 繞。 Ecology and distribution Thalassiosira eccentrica is a planktonic species in both coastal and oceanic waters. Due to a broad temperature range, T. eccentrica is distributed from polar region to tropical waters. This species could also be found in sediment, intertidal zone, surface of macroalgae and digestive tract of benthic animals. 生態與分佈 離心列海鏈藻是近海、大洋廣布性浮游物種。離心列海鏈藻溫度耐受範圍廣，從極
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