324 Phaeocystis globosa 球形棕囊藻 Phylum: Haptophyta 门：定鞭毛門 Class: Coccolithophyceae 纲：顆石藻綱 Order: Phaeocystales 目：棕囊藻目 Family: Phaeocystaceae 科：棕囊藻科 Morphology Two stages occur in the life cycle of Paeocystis globosa, a motile unicellular stage and a nonmotile colony-forming stage. Cells in unicellular stage have two flagellates longer than cell lengths and a very short haptonema. Colony-forming cells are embedded in a large smooth mucilage sphere, forming a thin monolayer and evenly distributed along the periphery of the colony. The spherical colonies possess diameters up to 4-7 cm and is visible to naked eyes. Both flagellates and haptonema of colony-forming cells are absent. Two yellow-brown chloroplasts are present in cytoplasm. 形態 球形棕囊藻生活史有可運動的單細胞以及不能運動並形成群落兩個階段。單細胞 形態有兩根長於細胞長度的鞭毛和一根極短的定鞭毛。群落階段細胞被包裹在一 個大而光滑的膠質球內，均勻分佈在球的分佈於群落的邊緣組成薄薄的一層。球狀 群落直徑最高可達4到7釐米，肉眼可見。群落階段細胞沒有鞭毛和定鞭毛。色素體 兩個，黃褐色。 Ecology and distribution Phaeocystis globosa is a cosmopolitan planktonic species widely distributed in temperate to tropical waters. Phaeocystis globosa is a bloom forming species and has caused 20 blooms in Hong Kong coastal waters from 2002 to 2023. Phaeocystis globosa also formed blooms frequently worldwide and caused fish-kill events due to the clog of fish nets induced by the mucilage colony. The foam produced in bloom may reach several meters
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