Class Dinophyceae Pascher (1914)
   Order Peridiniales Haeckel (1894)
     Family Pyrophacaceae Er. Lindem. (1928) see Family Pyrocystaceae (F. Schütt) Lemmerm. (1899)
       Genus Pyrophacus F. Stein (1883)
         1 Pyrophacus horologium Stein (1883)
         2 Pyrophacus steinii (Schiller) Wall & Dale