Coccolithophyceae - Prymnesiophycidae - Prymnesiophycidae
Parent taxon: Prymnesiophycidae according to P. R. Bown and J. R. Young 1997
Sister taxa: Braarudosphaeraceae, Centosphaera, Ceratolithina, Ceratolithoides, Chiphragmalithus, Coccolithites, Coccolithus, Cricolithus, Cruciplacolithus, Discoaster, Haqius, Kokia, Liliasterites, Markalius, Marthasterites, Microrhabdulaceae, Nannoconaceae, Neochiastozygus, Orthogonoides, Pontosphaera, Prinsiosphaera, Prolatipatella, Repagulum, Rhabdolithus, Schizosphaerellaceae, Tortolithus, Triquetrorhabdulus, Watkinsia, Zygolithus, Zygrhablithus
Subtaxa: Calcivascularis Conusphaera Eoconusphaera
Ecology: passively mobile planktonic "photoautotroph"
Distribution: found only at Heisterholz, near Petershagen, Nordrhein-Westfalen (Cretaceous of Germany)