Subfamily Helgolandinioideae

Subfamily Helgolandinioideae

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. Extant genera: Alexandrium Halim, 1960a. (=Gessnerium Halim, 1967 ex Halim, 1969; taxonomic junior synonym according to Balech, 1990b) (=Protogonyaulax Taylor, 1979; taxonomic junior synonym according to Balech, 1985b) Fragilidium Balech, 1959 ex Loeblich III, 1965. Helgolandinium von Stosch, 1969. Pyrophacus Stein, 1883. Fossil genus: Tuberculodinium Wall, 1967; Pleistocene.

Parent: Family Goniodomaceae part 1