Citation: Helgolandinioideae Fensome et al. 1993b.
Diagnosis: Goniodomaceans with either or both of the following characters: 1) the tabulation has more than the typical goniodominean number of plates in at least two plate series; 2) within the life-cycle there is a nonpreservable smooth cellulosic cyst with a chasmic archeopyle. Type genus: Helgolandinium von Stosch 1969.
Alexandrium Halim 1960a.
Fragilidium Balech 1959 ex Loeblich III 1965. Helgolandinium von Stosch 1969.
Tuberculodinium Wall 1967; Pleistocene.
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