228 Thalassiosira leptopus 細長列海鏈藻 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 disc-shaped, with circular and flat valves and rectangular girdle views. Frustules are strongly silicified. The areolae on valves are regular hexagonal shape, forming straight tangential rows intersecting in three directions, evenly distributed with uniform size. The only exceptions are areolae at the margins, with smaller sizes and irregularly arranged forms. Chloroplasts are small, granular, and numerous. 形態 細胞圓盤狀，殼面圓形，平坦，殼環面呈矩形。細胞硅質化程度強。殼面篩室呈規 則的六角形，沿三個方向形成交叉排列的直線，分佈均勻，大小均一。殼面僅最週 邊篩室較小，且不規則。色素體多，小顆粒狀。 Ecology and distribution Thalassiosira leptopus is a cosmopolitan planktonic species in both coastal and oceanic waters. Cells were also observed in the surface sediments on the shelf, on the surface of macroalgae and digestive tract of benthic animals. 生態與分佈 細長列海鏈藻是廣布性浮游物種，在近海和大洋均有分佈，也曾在陸架表層沉積物、 海藻表面以及底棲動物消化道內發現。
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