33 Cylindrotheca closterium 新月柱鞘藻 Phylum: Heterokontophyta 门：不等鞭毛门 Class: Bacillariophyceae 纲：羽紋硅藻纲 Order: Bacillariales 目：硅藻目 Family: Bacillariaceae 科：硅藻科 Morphology Cells are solitary with weakly silicified frustule. Valves are lanceolate, and abruptly narrow into long rostrate slightly bent or straight apices. 形態 細胞單個生活，細胞壁硅質化程度低。 殼面呈披針形，驟然收縮成較長的或彎曲 或直的末端。 Ecology and distribution Cylindrotheca closterium is a cosmopolitan marine to brackish water species widely distributed in temperate to tropical areas in the littoral zone. This species also occurs as epppyhytic form. 生態與分佈 新月柱鞘藻是廣泛分佈在溫帶和熱帶的近岸海洋和半鹹水物種，也可以附著生存。 Size Length （Apical axis）: 57-208 μm (Allen and Cupp, 1935); 50-80 μm (Hendey, 1964）; 20-90 μm (Chin et al.,1965); 20-180 μm (Chin et al., 1982); 32-150 μm (Isamu, 1991); 30-400 μm (Tomas, 1997); 28-67 μm (Al-Yamani et al., 2011; 2019); 12-400 μm (Law,
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