Calcidiscus Kamptner 1950
PaleoDB taxon number: 255405
Parent taxon: Prymnesiophyceae according to K. Fujioka et al. 1998
Sister taxa: Coccolithales, Discoasterales, Isochrysidales, Phaeocystales, Prymnesiales, Zygodiscales, Calyptrosphaeraceae, Prymnesiophycidae, Goniolithaceae, Watznaueriales, Syracosphaerales, Eiffellithales, Lapideacassaceae, Cyclicargolithus, Sphenolithus, Podorhabdales, Stephanolithiales, Arkhangelskiales, Eodiscoaster
Subtaxa: Calcidiscus leptoporus, Calcidiscus macintyrei