231 Thalassiosira pseudonana 假微型海鏈藻 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 solitary or form loose short chains. Cells could also occur in dense mucilaginous colonies. Valves are round and flattened with tiny diameter less than 10 μm generally. 形態 細胞獨立生活或形成鬆散的短鏈狀群體，或被膠質包裹成群體。殼面圓，扁平，直 徑較小，一般小於10微米。 Ecology and distribution Thalassiosira pseudonana is a cosmopolitan planktonic species in coastal waters. This species is a bloom forming species and has formed 7 blooms in Hong Kong coastal waters since 1989. 生態與分佈 假微型海鏈藻是近岸廣布性浮游物種。本物種也是紅潮原因種，自1989 年以來在 香港海域引發7次紅潮。 Size Diameter: 3.5-9 μm (Law, 2018); 3-6 μm (Gao et al., 2021)
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