Diagnosis:Goniodomaceans in which the posterior sulcal homologue and right sulcal homologue are within the sulcus, and which have fossilizable cysts.
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.