279 Protoperidinium oceanicum 海洋原多甲藻 Phylum: Dinoflagellata 门：甲藻門 Class: Dinophyceae 纲：甲藻綱 Order: Peridiniales 目：多甲藻目 Family: Protoperidiniaceae 科：原多甲藻科 Morphology Cells are solitary, large, slightly dorsoventrally compressed, broadly pyriform. The epicone tapers rather abruptly into the long slender apical horn with a flat end. Two long, slender, antapical horns arise posteriorly, tapering into pointed ends. The cingulum with prominent, thin list is descending and displaced about 1-2 cingular widths. The sulcus is also bordered by narrow sulcal lists and extends to the bottom of hypocone. 形態 細胞獨立生活，粒徑較大，略背腹扁平，整體近寬梨形。上殼逐漸收縮成細長的頂 角，末端平截。兩個細長的底角從底端伸出，逐漸收縮成較尖銳的末端， 橫溝具較明顯較薄的邊翅，下行位移1-2 倍橫溝寬度。縱溝也具邊翅，延伸至細胞 底部。 Ecology and distribution Protoperidinium oceanicum is a widely distributed species in warm temperate to tropical waters. It is found in both coastal and oceanic region. 生態與分佈 海洋原多甲藻廣泛分佈於暖溫帶至熱帶海域，在近岸和大洋都有記錄。 Size
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