甲藻門Dinophyta
雙鞭藻綱Dinophyceae
植甲藻目 Phytodiniales
植甲藻科 Phytodiniaceae
四甲藻屬Tetradinium
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.