overview (8)
Arkhangelskiales (2)
Eiffellithales (3)
Holococcoliths (26)
Nannoliths (10)
Podorhabdales (7)
Watznaueriales (1)
Pontosphaera rimosa (Bramlette & Sullivan, 1961) Roth & Thierstein, 1972
Description: Simple unadorned plate with a large central hole; the rim is narrow and not distinct from the plate in XPL.
Remarks:
Neogene: Pontosphaera
Paleogene: Pontosphaera rimosa