Umbellosphaera

Edited by Debbie Pledge on Wed, 15/07/2009 - 10:50

Genus Umbellosphaera Paasche in Markali and Paasche, 1955

Description: Coccoliths trumpet-shaped. Main part is R-unit, with narrow V-unit round base, but only tube is thick enough to give strong birefringence.

Remarks: In cross polars Umbellosphaera coccoliths resemble a small Reticulofenestra with a wide dark rim. The genus is characteristic of oligortrophic surface waters.

Original description: