76 Pleurosigma acutum 端尖斜紋藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Bacillariophyceae 纲：羽紋硅藻綱 Order: Naviculales 目：舟形藻目 Family: Pleurosigmataceae 科：斜紋藻科 Morphology The valves are long narrow S-shaped, with a sharp end. The ratios of length (apical axis) to width (transapical axis) range from 10 to 12. Two ribbon-like chloroplasts are present in cell. 形態 殼面呈狹長的S形，末端很尖。長寬比約為10到12比1。色素體兩個，帶狀。 Ecology and distribution Pleurosigma acutum is a benthic species which could also be founded in waters. 生態與分佈 端尖斜紋藻是底棲物種，但水體中也有發現。 Size Length (apical axis): 160-300 μm (Chin et al., 1982; Cheng et al., 2013) Width (transapical axis): 20-28 μm (Chin et al., 1982; Cheng et al., 2013) 粒徑
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