282 Prorocentrum donghaiense 東海原甲藻 Phylum: Dinoflagellata 门：甲藻門 Class: Dinophyceae 纲：甲藻綱 Order: Prorocentrales 目：原甲藻目 Family: Prorocentraceae 科：原甲藻科 Morphology Cells are solitary or form short chains. Cells were asymmetric, with relatively flat or roughly round anterior end and narrow antapex. One side of the anterior end sometimes often have a slight extension. The lengths are generally larger than width. 形態 細胞單個生活或形成短鏈。細胞不對稱，上端相對平坦或圓形，下端較窄。頂端的 一側經常會有輕微延長。一般長大於寬。 Ecology and distribution Prorocentrum donghaiense is bloom forming species which is widely distributed in coastal waters.12 Prorocentrum donghaiense blooms occurred in Hong Kong coastal waters from 1984 to 2023. 生態與分佈 東海原甲藻是廣布性近岸浮游物種。分佈廣泛。可引發紅潮。1984 年至2023年， 香港水域發生過十二次東海原甲藻水華。 Size Length: 18.6-21.6μm (Lu et al., 2005); 17-23 μm (Yang et al., 2014); 15-60 μm (Law,
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