127 Guinardia striata 斯氏幾內亞藻 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 frustules are long curved cylindrical shapes with a diameter of 6 to 45 µm and a length up to 250 µm. The valve is relatively flat and round on the edge. A thin oblique spine on the margin of valve fits into a dent on the adjacent cell, forming a spiral chain. Numerous small, elliptic chloroplasts are present at cell periphery. 形態 細胞為直徑 6到45微米的弧形彎曲的長圓柱形，細胞長度最多可達250微米。殼 面較平,在邊緣近弧形。殼面邊緣有一斜向外的小刺，插入相鄰細胞的凹陷處形成 螺旋狀群體。色素體較小，橢圓形，數量較多，主要分佈在細胞周邊表面。 Ecology and distribution Guinardia striata is a cosmopolitan neritic species from temperate to tropical waters. Guinardia striata is a bloom forming species. In Hong Kong coastal waters, Guinardia striata formed one red tide together with Leptocylindrus minimus and Thalassiosira sp. in 1991. 生態與分佈 斯氏幾內亞藻是廣布性近岸物種，廣泛分佈於溫帶到熱海區域。斯氏幾內亞藻 是紅潮原因種，曾於1991 年在香港海域與小細柱藻和海鏈藻共同引發一次紅潮。
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