overview (8)
Arkhangelskiales (2)
Eiffellithales (3)
Holococcoliths (26)
Nannoliths (10)
Podorhabdales (7)
Watznaueriales (1)
Umbellosphaera tenuis (Kamptner, 1937) Paasche in Markali and Paasche, 1955 [Coccolithus]
Description: Coccoliths convex outwards, relatively heavily calcified, with ridges on the distal surface.
Remarks: This form is substantially more robust than U. irregularis and is much more common in the fossil record.
Original description:
Synonyms:
Neogene: Umbellosphaera tenuis