318 Dictyocha octonaria 硅鞭藻 Phylum: Heterokontophyta 门：不等鞭毛門 Class: Dictyochophyceae 纲：硅鞭藻綱 Order: Dictyochales 目：硅鞭藻目 Family: Dictyochaceae 科：硅鞭藻科 Morphology Cells are solitary, spherical, silicified skeleton-bearing with a flagellum arising apically. Species could mainly be identified based on the skeleton which is the much more frequently observed than the whole cells in field sample fixed with Lugols’s solution or formaldehyde. The skeleton is robust, hard, and composed of two hexagonal to decagonal rings of similar size connected by connecting struts. A robust spine protrudes at each corner. 形態 細胞單獨生活，球狀，細胞內具硅質化骨骼，前端有一條鞭毛。硅質化的骨骼是環 境水樣經魯格氏液或甲醛固定後在顯微鏡下觀測時比整個細胞更為常見，也是物 種鑒定主要依據。骨骼粗壯，堅硬，由兩個大小類似的六邊形到十邊形的環以及連 接兩個環的短柱組成。每一個角都有一根粗壯的刺伸出。 Ecology and distribution Dictyocha octonaria is a cosmopolitan species widely distributed worldwide in both coastal and oceanic waters. 生態與分佈 本物種是廣布性物種，在近岸和大洋均有分佈。
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