155 Stephanopyxis turris 塔形冠蓋藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Coscinodiscophyceae 纲：中心硅藻綱 Order: Rhizosoleniales 目：根管藻目 Family: Rhizosoleniaceae 科：根管藻科 Morphology Cells are generally pill-shaped and varied from roughly cylindrical to almost spherical shape in girdle view. Valves are circular, generally convex, being covered by hexagonal areolae with almost similar size (4 to 5 in 10 μm). Cells are united by numerous (usually 9 to 10) hollow spines located near the valve margin. Chloroplasts are numerous and discoid. 形態 細胞殼環面觀呈藥丸狀，並可從大致圓柱狀到球狀轉換。殼面圓而凸起，分佈著大 小相近的六邊形篩室（每10 微米4 到5 個）。相鄰細胞通過靠近殼面邊緣的數條 （通常9到10條）中空刺相連成鏈。色素體多，盤狀。 Ecology and distribution Stephanopyxis turris is a cosmopolitan, neritic, and planktonic species which is mainly distributed in temperate to tropical waters. 生態與分佈 塔形冠蓋藻是廣布性近海浮游性物種，主要分佈在溫帶至熱帶海域。 Size
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