From Williams et al., 2017:

[Pyrophacus, Stein, 1883, p. 9, 26, 28–29.

Dinoflagellate genus based on the motile stage.

Tax. jr. syn.: Tuberculodinium, by implication in Wall and Dale (1971, p.234), who included the "type species", Tuberculodinium vancampoae, in Pyrophacus — however, Head (1996b, p.1232) retained Tuberculodinium.]