†family Rhagodiscaceae Hay 1977 (haptophyte alga)
Coccolithophyceae - Eiffellithales - Rhagodiscaceae
Parent taxon: Eiffellithales according to P. R. Bown and J. R. Young 1997
Sister taxa: Chiastozygaceae, Eiffellithaceae
Subtaxa: Calcicalathina Percivalia Rhagodiscus
Ecology: passively mobile planktonic "photoautotroph"
Distribution: