45 Nitzschia sigma 彎菱形藻 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. Valves are long, linear, and weakly sigmoid. Two large golden-brown chloroplasts are present on each side of centrally placed nucleus. 形態 細胞單個生活。殼面細長，輕微彎曲成S形。色素體兩個，黃褐色，較大，位於中 央細胞核兩側。 Ecology and distribution Nitzschia sigma is a benthic species preferring warm waters. Cells are often observed in sediment and intertidal zones. They could also attach on the surface of macroalgae. 生態與分佈 彎菱形藻暖水性底棲物種，常在沉積物、潮間帶中發現，也可附著在大型海藻表面。 Size Length (apical axis): 142-165 μm (Chin et al., 1982); 330 μm (Isamu,1991); 200-223 μm (Al-Yamani et al., 2011, 2019) Width (transapical axis): 7-11μm (Chin et al., 1982); 10 μm (Isamu,1991); 8到11 μm
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