201 Lauderia annulata 環紋婁氏藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Mediophyceae 纲：中型硅藻綱 Order: Thalassiosirales 目：海鏈藻目 Family: Lauderiaceae 科：勞德藻科 Morphology Cells are cylindrical. Valves are round, convex, with a slight depression in the center and rounded at the margins. Numerous processes (fultoportulae) with varying lengths are scattered near the valve edge and arranged in a conspicuous ring. Adjacent cells are united by mucilage threads from fultoportulae and form straight chains. The cytoplasm contains numerous small plate-shaped chloroplasts. 形態 細胞圓柱狀。殼面圓，隆起，中央略凹，邊角圓形。殼面近邊緣處分佈許多長短不 一的棘（支持突），排列成一個明顯的圓圈。相鄰細胞通過支持突膠質線連成直鏈。 色素體較多，小，板狀。 Ecology and distribution Lauderia annulata is a neritic temperate species. 生態與分佈 環紋婁氏藻是溫帶近岸物種。 Size Height (pervalvar axis): 26-96 μm (Tomas, 1997; Gao et al., 2021); 50 μm (Guo et al.,
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