79 Pleurosigma pelagicum 海洋斜紋藻 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 Valves are slightly S-shaped. Frustules are wide in the middle and sharply narrow towards both ends, terminating with a pointed tip. The lengths (apical axis) are roughly 5 times of widths (transapical axis). 形態 殼面輕微S形。細胞中部寬，向兩端急劇變窄，端尖。長（縱軸）寬（橫軸）比約 為5:1。 Ecology and distribution Pleurosigma pelagicum is a cosmopolitan planktonic species. Cells could also be observed in sediment or attach on the surface of macroalgae. 生態與分佈 廣布性浮游物種，但也常在沉積物中發現，也可附著在大型海藻表面。 Size Length (apical axis): 189-218 μm (Chin et al., 1965); 180-266 μm (Cheng et al., 2013; Gao et al., 2021) Width (transapical axis): 33-36.3 μm (Chin et al., 1965); 33-47 μm (Cheng et al., 2013;
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