From Fensome et al., 2019:

Pyrophacus, Stein, 1883, p.9,26,28–29.
Taxonomic junior synonym: 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.