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甲藻門 Dinophyta
雙鞭藻綱 Dinophyceae
植甲藻目 Phytodiniales
植甲藻科 Phytodiniaceae
四甲藻屬 Tetradinium Klebs, 1912
描述:Tetrahedral cells with 1–2 spines at each corner. Attachment stalk sometimes present, the species mainly occur as epiphytes. Reproduction by 2 autospores or zoospores seen in T. minus Pascher.