Diagnosis: Peridiniaceans in which the episomal tabulation is bipesioid and the Kofoid second anterior intercalary plate is hexa (i.e. six-sided). The cyst is organic-walled. The archeopyle involves anterior intercalary plates and precingular plates and sometimes also the dorsal third apical plate.
Type genus:
Palaeoperidinium Deflandre 1934; fossil - Late Cretaceous.
Chichaouadinium Below 1981a; Cretaceous (Albian).
Colonsaydinium Hunt in Hunt et al. 1985; Late Quaternary.
?Diconodinium Eisenack and Cookson 1960; Cretaceous (Santonian).
Dioxya Cookson and Eisenack 1958; Cretaceous (Albian).
Geiselodinium Krutzsch 1962; Mid Eocene.
Ginginodinium Cookson and Eisenack 1960a; Cretaceous (Albian-Cenomanian).
?Indosphaera Kumar 1986b; Jurassic (Kimmeridgian-Tithonian).
Jinhudinium Qian Zeshu et al. 1986; Paleocene-Eocene.
Laciniadinium McIntyre 1975; Cretaceous (Campanian).
Luxadinium Brideaux and McIntyre 1975; Cretaceous (Albian).
Nanshadinium He Chengquan and Sun Xuekun 1991; Quaternary.
Palaeohystrichophora Deflandre 1935; Cretaceous (Senonian).
Palaeoperidinium Deflandre 1934; Late Cretaceous.
?Phthanoperidinium Drugg and Loeblich Jr. 1967; Oligocene.
Saeptodinium Harris 1974; Paleocene.
Sanshuia Yu Jingxian et al. 1981; Late Cretaceous.
Soaniella Vozzhennikova 1967; Eocene-Early Oligocene.
Subtilisphaera Jain and Millepied 1973; Cretaceous (Aptian).
Teneridinium Krutzsch 1962; Eocene.
Vectidinium Liengjarern et al. 1980; Late Eocene-Early Oligocene.
Williamsidinium Lentin 1983; Cretaceous (Maastrichtian).