124 Guinardia flaccida 薄壁幾內亞藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Coscinodiscophyceae 纲：中心硅藻綱 Order: Rhizosoleniales 目：根管藻目 Family: Rhizosoleniaceae 科：根管藻科 Morphology The cells are straight or slightly curved cylindrical in shape, with obvious intercalary bands. The heights are generally 1.5 to 2 times of diameters (width). There are 1-2 blunt protrusions at the edge of the valve. Cells are solitary or form chains with almost no gaps between adjacent cells. The frustules are weakly silicified. The chloroplasts are star-like or granular. 形態 細胞壁呈圓柱形，較直或者輕微彎曲，間插帶較為明顯。高約為直徑（寬）的1.5 倍到兩倍左右。殼面邊緣有1-2個鈍突起。細胞單獨生活或者殼面相連形成短鏈， 相鄰細胞幾乎沒有縫隙。細胞壁硅質化程度較低，色素體星形或顆粒狀。 Ecology and distribution Guinardia flaccida is a cosmopolitan neritic species widely distributed from temperate to tropical waters. It was also reported Guinardia flaccida triggered a severe red tide in 1970s in Zhanjiang (Qi et al., 2004). However, no Guinardia flaccida bloom was recorded in Hong Kong coastal waters. 生態與分佈 薄壁幾內亞藻是分佈廣泛的近岸物種，從溫帶到熱帶均有記錄。薄壁幾內亞藻曾在 上世紀70年代在湛江引發嚴重紅潮 (齊雨藻等，2004)。香港海域並無薄壁幾內亞
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