Neococcolithes radiatus


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

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


Taxonomy:

Citation: Neococcolithes radiatus Bown & Newsam 2017
Rank: Species

Farinacci & Howe catalog pages: Neococcolithes radiatus *

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


Morphology remarks: 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, RIM: outer wall acw-imbricate, rim-narrow, CA: grill,
CSPH: not known, V-UNITS: c-str, rim, R-UNITS: none, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 5->8µm;
Sources: 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:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Neococcolithes

    References:

    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.


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    Neococcolithes radiatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-12-2018

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=928Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

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    Dave Bord

    Jeremy, please correct the TOP occurrence.

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    Jeremy Young (UK)

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

    Jeremy

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