Birkelundia arenosa

Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Birkelundia -> Birkelundia arenosa
Sister taxa: B. arenosa


Citation: Birkelundia arenosa Perch-Nielsen 1971
Rank: Species
Taxonomic discussion: Not widely used and posibly a synonym of Clausicoccus fenestratus but Bown & Newsam (2017) have assigned specimens to this species.

Distinguishing features: See generic diagnosis

Farinacci & Howe catalog pages: B. arenosa *

Morphology: Similar to Clausicoccus fenestratus but central plate appears less regular in SEM, and in LM appears to be uniformly dark rather than subdivided into discrete sub-plates.

Search data:
TagsLITHS: placolith, elliptical, CA: ca_disjunct, grill, vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
MetricsLith size: 1.5->5µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Range is very poorly documented. Range given below is based on range of illusrated speciemns in Bown & Newsam (2017) and Perch-Nielsen (1971)
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: see stratigraphic occurrence notes
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: see stratigraphic occurrence notes

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

Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

Perch-Nielsen, K. (1972b). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs V O


Birkelundia arenosa compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021

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

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