Habibacysta
Hafniasphaera
Hapsidaulax
Hapsocysta
Hashenia
Headinium
Hebecysta
Heibergella
Helbydinium
Heliodinium
Hemicystodinium
Hemiplacophora
Hemisphaeridium
Hemistomiosphaera
Heptasphaera
Herendeenia
Heslertonia
Heteraulacacysta
Heterosphaeridium
Hexagonifera
Hexasphaera
Hexasphaera
Histiocysta
Histiophora
Holmwoodinium
Homotryblium
Horologinella
Huanghedinium
Hurlandsia
Hurunuia
Hyalosphaera
Hystrichodinium
Hystrichogonyaulax
Hystrichokibotium
Hystrichokolpoma
Hystrichosphaera
Hystrichosphaera subgenus Hystrichosphaera
Hystrichosphaera subgenus Hystrichosphaeropsis
Hystrichosphaeridium
Hystrichosphaerina
Hystrichosphaeropsis
Hystrichostrogylon