118 Melosira moniliformis 念珠直鏈藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Coscinodiscophyceae 纲：中心硅藻綱 Order: Melosirales 目：直鏈藻目 Family: Melosiraceae 科：直鏈藻科 Morphology Cells are nearly spherical, or pill shaped with height slightly larger than width in girdle view. Valves are circular round and convex in a hemispherical shape. Adjacent cells are connected at the valve center by mucilage pads, forming long chains. Cells can also attach to the seaweed surface and other bases via short stalks. Frustules are thick. Chloroplasts are small, and numerous, and located along the cell wall. 形態 細胞殼環面觀近球形或膠囊形狀，高略大於寬。殼面圓，凸起呈半球狀。相鄰細胞 通過膠質在殼面相連形成長鏈。細胞也可以形成短柄附著於海藻以及其他固著基 表面。細胞壁厚。色素體小而多，沿細胞壁分佈。 Ecology and distribution Melosira moniliformis is a coastal benthic epiphytic diatom with a broad temperature range which is distributed in tropical to cold zones. Cells are found in digestive tracts of benthic animals, sediment and water bodies. They can also attach on the surface of seagrass and macroalgae. Melosira moniliformis can live in both seawater and freshwater. 生態與分佈 念珠直鏈藻是廣溫近岸底棲性附生硅藻，熱帶到寒帶皆有。細胞常見於底棲動物消 化道、沉積物和水體，也可附著在海草和大型海藻表面。念珠直鏈藻可以在海水或 淡水中生活。
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