Discoaster williamsii


Classification: Coccolithophores -> Discoasterales -> Discoasteraceae -> Discoaster -> D. nodifer group -> Discoaster williamsii
Sister taxa: D. cruciformis, D. colletii, D. gemmifer, D. mediosus, D. binodosus, D. nodifer, D. distinctus, D. septemradiatus, D. tanii, D. tani ornatus, D. istanbulensis, D. martinii, D. williamsii, D. backmanii, D. okadai,

Taxonomy:

Citation: Discoaster williamsii Bown & Dunkley Jones, 2012
Rank: Species
Notes & discussion: Distinguished from Discoaster nodifer by the broad central area and large central area bosses.

Distinguishing features: 5-6 rayed discoaster with broad central area that is distinctly elevated on both faces. The rays are narrow and free for around half their length. Paired lateral nodes just before the ray tips are present in some specimens

Farinacci & Howe catalog pages: Discoaster williamsii * , ,


Size: Holotype length 14.0 microns

Search data:
TagsLITHS: nannolith-radiate, star-shaped, RIM: free-rays-long, PROCESS: boss, boss-prox & dist,
CSPH: not known, V-UNITS: all, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 10->18┬Ám; Segments: 5->6;
Sources: size from illustrated specs
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 NP15b subzone (44.12-45.49Ma, base in Lutetian stage). Data source: Bown & Dunkley Jones, 2012

Plot of occurrence data:

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

    References:

    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


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    Discoaster williamsii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-7-2019

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=515 Go to Archive.is to create a permanent copy of this page - citation notes



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