Sister taxa: none
Subtaxa: Actiniscales Actinotheca Aiora Anthatractus Apteodinium Arcticacysta Aremoricanium Belodinium Bicarinellum Broomea Calcicarpinium Calcigonellum Calciogranellum Calcipterellum Calcisphaerellum Cantulodinium Ceratocoryaceae Chiropteridium Cryptarchaeodinium Cymatiogalea Danea Diconodinium Dictyopyxidia Diornatosphaera Diplotesta Disconodinium Distatodinium Downiesphaeridium Echinidinium Eodinia Evansia Exochosphaeridium Favilarnax Galea Gillinia Gonyaulacales Gymnodinium Heliodinium Heteraulacacysta Heterocapsaceae Histiophora Horologinella Hystrichokibotium Hystrichosphaeropsis Invertocysta Kofoidopsis Komewuia Lirellidae Lithodinia Lithoperidinium Membranophoridium Millioudodinium Multiplicisphaeridium Nannoceratopsiaceae Nannoceratopsiella Nelsoniella Odontochitinopsis Oodnadattia Ovoidinium Palaeoglenodinium Palaeoperidinioideae Palaeotetradinium Paleopedicystus Palmnickia Pareodiniaceae Pentafidia Peridiniales Peridinites Phanerodinium Polyedryxium Polykrikaceae Polystephanephorus Polystephanosphaera Priscogalea Prolixosphaeridium Pseudodeflandrea Ptychodiscales Pulvinosphaeridium Raphidodinium Rottnestia Samlandia Scriniocassis Spherites Spiniferites Stephanelytron Taeniophora Teneridinium Tenua Ternia Thoracosphaerales Toolongia Triblastula Trichodinium Valvaeodinium Vulcanisphaera Wallodinium Wetzeliella Wetzelodinium Xenicodinium Xenikoon