136 Rhizosolenia crassispina 厚刺根管藻 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 solitary or form short chains. The overall shape is cylindrical, with slightly asymmetrical cones from girdle view. A long, hollow, strait, and robust spine is formed at the valve apex, tapering needle-shaped towards the distal part. Frustules are thin. The chloroplasts are granular, small, and numerous, distributed along cell wall. 形態 細胞單獨生活，或組成短鏈。整體外觀呈圓筒狀，殼環面觀看殼面呈稍微傾斜的錐 形，錐形頂端有一個中空、筆直、粗壯的長刺，末端尖細。細胞壁較薄。色素體多， 小顆粒狀，近細胞壁分佈。 Ecology and distribution Rhizosolenia crassispina is a preferably oceanic species with a broad temperature range. 生態與分佈 厚刺根管藻可能是廣溫外洋性物種。 Size Length (pervalvar axis): 300-420 μm (Schmidt et al., 1920); 423 μm (Chin et al., 1965).
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