| Diplodinium G.A. Klebs, 1912 |
| Diplodinium lunula (F. Schütt) G. Klebs, 1912 |
| Fragilidium Balech ex A.R. Loebl., 1965 |
| Fragilidium mexicanum Balech, 1988 |
| Fragilidium subglobosum (Stosch) Loeblich III, 1965 |
| Helgolandinium Stosch, 1969 |
| Helgolandinium subglobosum Stosch, 1969 |
| Pyrocystaceae Lemmerm., 1899 |
| Pyrocystis J. Murray ex Haeckel, 1890 |
| Pyrocystis elegans Pavill., 1931 |
| Pyrocystis fusiformis C.W. Thomson ex Haeckel, 1890 |
| Pyrocystis fusiformis f. detruncata Matzen., 1937 |
| Pyrocystis fusiformis f. lanceolata (Schröd.) F.J.R. Taylor, 1976 |
| Pyrocystis gerbaultii Pavill., 1935 |
| Pyrocystis hamulus Cleve, 1900 |
| Pyrocystis hamulus var. semicircularis Scrhöd., 1906 |
| Pyrocystis lunula (F. Schütt) F. Schütt, 1896 |
| Pyrocystis noctiluca J. Murray ex Haeckel, 1890 |
| Pyrocystis obtusa Pavill., 1931 |
| Pyrocystis pseudonoctiluca Thomson, 1876 |