Reticulofenestra westerholdii

Classification: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. reticulata group -> Reticulofenestra westerholdii
Sister taxa: R. reticulata, R. isabellae, R. erbae, R. nanggulanensis, R. westerholdii, C. artuziae, R. sp. cf. reticulata


Citation: Reticulofenestra westerholdii Bown & Dunkley Jones, 2012
Rank: Species

Distinguishing features: Similar to R. reticulata but smaller and without visible net

Farinacci & Howe catalog pages: R. westerholdii *

Morphology: Medium sized (5-8µm), circular reticulofenestrids with open central area (similar in width to, or slightly narrower than, the rim width) but no perceptible net.

Distinguished from R. reticulata by the smaller size, narrower tube, proportionally wider central area and absence of visible net. Distinguished from C. floridanus by the circular outline, wider central area and low tube cycle

Size: Holotype length 6.9µm.

See also: Reticulofenestra wadeae - similar but larger & central area broader;

Search data:
TagsLITHS: placolith, circular, CA: ca_conjunct, grill, vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 5->8µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP19-20 zone (34.44-36.97Ma, top in Priabonian stage). Data source: Bown & Dunkley Jones, 2012
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Bown & Dunkley Jones, 2012

Plot of occurrence data:


Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O

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

Jones, A. P. & Dunkley Jones, T. (2020a). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 30(1): 57-79. gs V O


Reticulofenestra westerholdii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-11-2020

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

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