267 Gambierdiscus 岡比藻 Morphology Cells are large, round to ellipsoid, and flattened anterio-posteriorly. The apical and antapical views are much more frequently observed than others under light microscope. The epicone and hypocone are nearly equal in height. The cingulum with wide cingular lists is narrow and deeply excavated, ascending slightly. Sulus is short and deeply concave. The shape and size of apical pore complex is a key distinguishing feature. Cells surface is smooth, and the theca plates are very thick. 形態 細胞較大，圓形或橢圓形，上下扁平。光鏡下細胞頂端和底端一面更常被觀察到。 上殼和下殼大小幾乎一致。橫溝具寬翼，較窄，深凹， 輕微下移。縱溝短，深凹。 頂孔的形狀和大小是鑒定的重要依據。細胞表面平滑，甲板較厚。 Ecology and distribution Gambierdiscus are basically benthic and epiphytic species and can be tychoplanktonic. They are found on macroalgae, coral reefs, shallow lagoons, and bays of tropical and subtropical areas. Some Gambierdiscus species are capable to produce ciguatoxin (CTX), gambieric acid, and maitotoxin (MTX). 生態與分佈 岡比藻一般是底棲、附生生物，偶爾也會短期浮游。岡比藻可以在熱帶和亞熱帶的 一些大型海藻、珊瑚礁、較淺的瀉湖、海灣發現。部分岡比藻物種可以產雪卡毒素、 gambieric acid、刺尾魚毒素 Size
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