112 Coscinodiscus wailesii 威利圓篩藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Coscinodiscophyceae 纲：中心硅藻綱 Order: Coscinodiscales 目：圓篩藻目 Family: Coscinodiscaceae 科：圓篩藻科 Morphology Cells are large, and cylindrical, with a rectangular girdle view. The heights (pervalvar axis) are equal with diameters (apical axis) or slightly smaller. Frustules are weakly silicified. Valves are circular, flat, or slightly concave in the center. Central hyaline areas are prominent. Areolae are small (6-7/10 μm) and radiating from the central area to the margin. Mantles are deep and possess hexagonal areolae. Chloroplasts are small, numerous, and irregular in outline. 形態 細胞呈較大的短圓柱狀，殼環面呈規則的矩形。高（貫殼軸）和直徑（縱軸）大致 相同或略小。細胞壁硅質化程度較低。殼面圓形，平，或中央略凹，中央無紋區明 顯。篩室較小，自殼面中央到邊緣呈放射狀排列。殼套較深，有六角形孔紋，色素 體小而多，盤狀。 Ecology and distribution Coscinodiscus wailesii is mainly observed in coastal areas of temperate and subtropical waters. This species is a bloom forming species but has not caused blooms in Hong Kong coastal waters. 生態與分佈 威利圓篩藻主要分佈在溫帶和亞熱帶近海。本物種是紅潮原因種，但在香港尚未引
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