251 Tripos furca 叉狀角藻 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 occasionally form chains. The epicone is roughly conical, gradually tapering into long, straight, and robust apical horn with open and blunt end. Cells are widened in the cingular region. The hypocone possess oblique basal contour and two unequal parallel or slightly divergent horns directed posteriorly, with tapering pointed and close tips. The left antapical horn is more robust and longer than right antapical horn, with almost twice the length. Cells possess thick thecal plates and numerous chloroplasts. 形態 細胞單獨生活，偶爾形成短鏈。上殼大致呈錐形，逐漸收縮成長且直的粗壯的頂角， 末端開口，平截。橫溝處較寬。下殼底緣斜平。左、右底角不等長，接近平行或略 分叉，向後伸出，末端收縮，尖且封閉。左底角常較右底角粗壯且長，為右底角長 度的2倍以上。細胞甲板較厚，色素體較多。 Ecology and distribution Tripos furca is a cosmopolitan species in both coastal and oceanic waters from cold temperate to tropical region. Tripos furca is bloom forming species and is frequently observed. According to Hong Kong Red Tide Database from AFCD (Agriculture, Fisheries and Conservation Department), Tripos furca has caused 36 blooms in Hong Kong coastal waters since 1983.
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