Semihololithus pseudobiskayae

Classification: ntax_cenozoic -> Holococcoliths -> fossil holococcoliths -> Semihololithus -> Semihololithus pseudobiskayae
Sister taxa: S. biskayae, S. dimidius, S. kanungoi, S. pseudobiskayae, S. sp. cf. S. biskayae, S. tentorium, N. figularia, N. hexaporus, S. sp.


Citation: Semihololithus pseudobiskayae Bown & Newsam 2017
Rank: Species

Distinguishing features: Large, blocky, with steep-walled rim and domed upper surface. Only known from LM side view

Farinacci & Howe catalog pages: S. pseudobiskayae *

Morphology: Large, blocky coccolith seen in side view, with steep-walled rim and domed upper surface.
Differentiation: Similar in overall shape to Semihololithus biskayae but has a more irregular appearance, lower birefringence image and blockier upper cover. [Bown & Newsam 2017]

Size: Holotype L = 6.6μm, H = 6.5μm (Paratype L = 6.6μm, H = 6.8μm).

Search data:
TagsLITHS: holococcolith, hollow, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 5->7µm;
Data source notes: lith size from OD & extended slightly
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP14b subzone (46.29-47.84Ma, top in Lutetian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: Bown & Newsam 2017

Plot of occurrence data:


Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O


Semihololithus pseudobiskayae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-4-2021

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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