overview (8)
Arkhangelskiales (2)
Eiffellithales (3)
Holococcoliths (26)
Nannoliths (10)
Podorhabdales (7)
Watznaueriales (1)
Heliolithaceae Hay & Mohler, 1967
Description: Discoidal discoasteralids with several distinct cycles including at least one that is birefringent cycle.
Remarks: Group of nannoliths closely allied to the discoasters, and probably transitional between typically VR heterococcolith morphology and the more derived, single crystal-unit form of Discoaster.
Paleogene: Heliolithaceae