216 Detonula pumila 矮小短棘藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Mediophyceae 纲：中型硅藻綱 Order: Thalassiosirales 目：海鏈藻目 Family: Thalassiosiraceae 科：海鏈藻科 Morphology Cells are cylindrical. Valves are round, more or less convex, and sometimes almost flat. Adjacent cells are united in long straight chains by a ring of marginal short processes and mucilage threads on the edge of valves. Intercalary bands are collar-like. The cytoplasm contains numerous small star-like chloroplasts. 形態 細胞呈圓柱形，殼面圓形，中央微凸或微凹,有時較平。相鄰細胞通過殼面邊緣一 圈小刺和膠質線相接形成長直鏈。間插帶領狀，色素體較多，星狀。 Ecology and distribution Detonula pumila is a cosmopolitan species in coastal area, but mainly distributed in warmer seas. 生態與分佈 矮小短棘藻是近岸廣布性物種，但主要分佈在較暖的海域。 Size Height (pervalvar axis): 60 μm (Chin et al., 1965); 15-120 μm (Tomas, 1997); 29.25 μm (Al-Kandari et al., 2009)
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