Tetradinium

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.