Diagnosis: Goniodomaceans in which the posterior sulcal homologue and right sulcal homologue are within the sulcus, and which have fossilizable cysts.
Type genus:
Pyrodinium Plate 1906.
Alisocysta Stover and Evitt 1978; Paleocene (Danian).
Biconidinium Islam 1983c; Early Eocene.
Capisocysta Warny and Wrenn 1997; Miocene-Holocene.
Dinopterygium Deflandre 1935; Late Cretaceous (Senonian).
Eisenackia Deflandre and Cookson 1955; Paleocene-Early Eocene.
Eocladopyxis Morgenroth 1966a; Early Eocene.
Geonettia de Verteuil and Norris 1996b; Late Miocene.
Homotryblium Davey and Williams 1966b; Early Eocene.
Hystrichosphaeridium Deflandre 1937b; ?Late Cretaceous.
Polysphaeridium Davey and Williams 1966b; Early Eocene.
?Taleisphaera Duxbury 1979a; Cretaceous (Barremian).
Tubidermodinium Morgenroth 1966a; Early Eocene.