142 Rhizosolenia imbricata 覆瓦根管藻 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 Cells are long, cylindrical, solitary or unite in short two-six-celled chains. Valves are eccentrically conical, forming a continuous line with the girdle margin on one side, but oblique on the other side. Valves terminated by a short spine which is swollen at the base and narrowing abruptly towards the distal part. Small lateral wings, which are located at the base, are about a third of the whole length of spines. Girdle is composed of two rows of scale-like intercalary bands. The cytoplasm contains numerous small granular chloroplasts distributed along the cell wall. 形態 細胞長圓柱形，單獨生活或形成2到6個細胞的短鏈。殼面斜錐形，一側與殼環面 邊緣形成一條直線，另一側傾斜。殼面頂端生一基部中空的短刺，末端尖細。端刺 基部具側翼，側翼長度約刺全長的1/3。殼環面具有兩列鱗片狀間插帶。色素體小， 顆粒狀，靠近細胞壁分佈。 Ecology and distribution Rhizosolenia hyalina is a neritic species widely distributed from temperate to tropical regions. It was also detected in polar regions. 生態與分佈 覆瓦根管藻是沿岸性熱帶和溫帶種類，廣泛分佈。極地也有分佈。
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