152 Rhizosolenia styliformis 筆尖形根管藻 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 slender and cylindrical. The valves are sharply inclined conical. A small robust spine with an enlarged and hollow basal part is observed at the valve apex, and lateral wings (Otarias) are located at the basal part. The chloroplasts are small and numerous. Cells are solitary or form short strait chains. 形態 細胞呈細長圓柱形。殼面呈高斜錐形，頂端有一粗壯小刺， 刺的基部膨大中空， 兩側具側翼。色素體小，數目較多。常單獨生活或形成較直的短鏈。 Ecology and distribution Rhizosolenia styliformis is a cosmopolitan species found in both coastal and oceanic waters. This species has a broad temperature range and could be observed from polar regions to tropical waters. 生態與分佈 筆尖形根管藻是大洋和近岸都廣泛分佈。本物種是廣溫性物種，從極地到熱帶均有 記錄。 Size
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