Neococcolithes radiatus

Classification: ntax_cenozoic -> Zygodiscales -> Zygodiscaceae -> Neococcolithes -> Neococcolithes radiatus
Sister taxa: N. dubius, N. lososnensis, N. minutus, N. nudus, N. protenus, N. purus, N. radiatus, N. sp.


Citation: Neococcolithes radiatus Bown & Newsam 2017
Rank: Species

Distinguishing features: Narrowly-elliptical, central area with numerous (18–22) radiating bars

Farinacci & Howe catalog pages: N. radiatus *

Morphology: Narrowly-elliptical murolith coccolith with a low birefringence, unicyclic rim image and central area with numerous (around 18–22) radiating bars.
Description: The rim shows relatively low birefringence in XPL as do the central area bars. Some specimens have outlines approaching rhomboidal.
Remarks: The rhomboidal outline and stratigraphic position close to the extinction of Neococcolithes dubius and first appearance of Isthmolithus recurvus suggest that this may be a transitional species between the two genera.
Differentiation: Distinguished from most other species of Neococcolithes, which have diagonal crossbars, by the more numerous central area bars. [Bown & Newsam 2017]

Size: Holotype L = 7.6μm (Paratype L = 6.4μm).

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, grill, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 5->8µm;
Data source notes: lith size from OD and slightly extended
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP17 zone (37.32-40.40Ma, top in Priabonian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP17 zone (37.32-40.40Ma, base in Bartonian 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


Neococcolithes radiatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-1-2021

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

Comments (1)

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Dave Bord

Jeremy, please correct the TOP occurrence.

Jeremy Young (UK)

oops yes NP177 was a rather unlikely extinction level. Thanks for pointing that out.


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