Class Dinophyceae Pascher (1914)
   Order Peridiniales Haeckel (1894)
     Family Oxytoxaceae Er. Lindem. (1928)
       Genus Thecadinium Kof. & Skogsb. (1928)
         Thecadinium kofoidii (E.C. Herdman) J. Larsen, 1985