Discoaster tanii

Classification: Coccolithophores -> Discoasterales -> Discoasteraceae -> Discoaster -> D. nodifer group -> Discoaster tanii
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,

Daughter taxa: (blue => in age window 0-800Ma)
Medium to large (9-19µm); wide central area; prominent boss on one side


Citation: Discoaster tanii Bramlette & Riedel, 1954
Rank: Species
Notes & discussion: Does not have the regular paired ray-nodes of Discoaster nodifer. This form has close morphological affinities to, and may intergrade with, Discoaster nodifer and Discoasterornatus, which are frequently classified as subspecies or closely-related species of Discoaster tanii.

Distinguishing features: 5 rayed stellate discoaster with long free rays of uniform width terminating in a flat or slightly notched ray-end. May show poorly developed unpaired lateral nodes on some rays.

Farinacci & Howe catalog pages: Discoaster tani * , Helio-discoaster tanii * ,

Search data:
TagsLITHS: nannolith-radiate, star-shaped, RIM: free-rays-long, tips w lateral nodes,
CSPH: not known, V-UNITS: all, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 9->15µm; Segments: 5->5;
Sources: size from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP23 zone (29.62-32.02Ma, top in Rupelian stage). Data source: PRB entry to Nannotax
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: PRB entry to Nannotax

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Discoaster tanii, synonyms included - Discoaster tani; Discoaster tanii; Discoaster tanii s.ampl.; Discoaster tanii subsp. indet.; Discoaster tanii tanii; space-time plot :: Samples map :: Parent: D. nodifer group


    Bramlette, M. N. & Riedel, W. R. (1954). Stratigraphic value of discoasters and some other microfossils related to Recent coccolithophores. Journal of Paleontology. 28: 385-403. gs


    Discoaster tanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=510 Go to Archive.is to create a permanent copy of this page - citation notes

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