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

Taxonomy:

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

    References:

    Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs

    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

    Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs

    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

    Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs

    Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs

    Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs

    Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs


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    Discoaster tanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-11-2019

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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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