Phytoplankton Species in Hong Kong Coastal Waters

192 Ditylum sol 太陽雙尾藻 Phylum: Heterokontophyta 门:不等鞭毛門 Class: Mediophyceae 纲:中型硅藻綱 Order: Lithodesmiales 目:石絲藻目 Family: Lithodesmiaceae 科:石絲藻科 Morphology Similar with Ditylum brightwellii, Ditylum sol cells possess a triangular prism shape, with a triangular valve and a roughly rectangular girdle view. There is a centrally located large hollow spine on each valve. However, Ditylum sol frustules are wider than Ditylum brightwellii, with diameters up to more than 200 µm. The edges of the valve are undulating (crenulate), and no short spines are observed. The crenulation extends throughout the girdle bands. Cells are generally solitary. 形態 和布氏雙尾藻類似,太陽雙尾藻細胞一般呈三棱柱形狀,殼面通常為三角形,殼環 面觀大致為矩形。殼面中央有一根中空大刺。相對於布氏雙尾藻,太陽雙尾藻更寬, 一般寬大于高或兩者近似,直徑最多可超過200 微米。殼面邊緣呈波浪形(細鋸齒 狀),沒有小刺。細胞壁殼環面具褶皺。細胞一般單細胞生活。 Ecology and distribution Ditylum sol is possibly a warm water species which is widely distributed in temperate, subtropical, and tropical waters. 生態與分佈 太陽雙尾藻可能是暖水性物種,廣泛分佈於溫帶、亞熱帶以及熱帶近海。

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