261 Tripos trichoceros 三叉角藻 Phylum: Dinoflagellata 门：甲藻門 Class: Dinophyceae 纲：甲藻綱 Order: Gonyaulacales 目：膝溝藻目 Family: Ceratiaceae 科：角藻科 Morphology Cells are solitary and seldom form chains. Cell wall are thin. The epicone is roughly triangular, tapering abruptly into the straight, long apical horn. The hypocone, which is slightly shorter than epicone, possess oblique bottom contour. The posterior horns extend a distance outwards and downwards, then bend upwards, forming U-shaped contour. The distal portion of the antapical horns is often weakly undulate. All three horns are slender and roughly parallel, with open flat tips. 形態 細胞單獨生活，很少形成鏈。細胞壁較薄。上殼近似三角形，驟然收縮成一個長且 直的頂角。下殼比上殼稍短，底緣傾斜。兩底角生出後弧形向上彎曲形成U形，底 角末端部分常形成輕微波浪狀。三個角都很細長，近乎平行，末端平截，開口。 Ecology and distribution Tripos trichoceros is a cosmopolitan neritic to oceanic species widely distributed in warm waters worldwide. 生態與分佈 三叉角藻在較暖的近岸和大洋廣泛分佈。 Size
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