Order
Watznaueriales Bown, 1987
In this study, all coccoliths with placolith structures have been assigned to the order Coccolithales. Three suborders have been identified within this order: Calcidiscineae, Coccolithineae, and Reticulofenestraineae.
Bown, P. R. 1987. Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. - Special Papers in Palaeontology. 38: 1-118
Schwarz, E. 1932. Beiträge zur Entwicklungsgeschichte der Protophyten. IX. Der Formwechsel von Ochrosphaera neapolitana. Archiv für Protistenkunde. 77: 434-462