Discoaster backmanii


Classification: Coccolithophores -> Discoasterales -> Discoasteraceae -> Discoaster -> D. nodifer group -> Discoaster backmanii
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 backmanii Agnini et al., 2008
Rank: Species
Synonyms: Discoaster sp. 1 Okada & Thierstein 1979 - also recorded as Discoaster sp. 1 by Monechi 1985 and Agnini et al. 2007 
Notes & discussion: Simlar morphotypes are listed under "Discoaster brouweri–like preservational morphotypes" - and including several taxa from the Palaeogene, but this is the earliest such form

Distinguishing features: 5-7 (typically 6) rayed, simple, stellate discoasters with broad, tapering rays joined along 1/2 their length.

Farinacci & Howe catalog pages: Discoaster backmanii * , ,

Search data:
TagsLITHS: nannolith-radiate, star-shaped, RIM: free-rays-long,
CSPH: not known, V-UNITS: all, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 7->15µm; Segments: 5->7;
Sources: size from OD
The morphological data given here can be used on the advanced search page. See also these notes

See also: Discoaster brouweri–like preservational morphotypes;

Geological Range:
Last occurrence (top): in lower part of NP9 zone (20% up, 56.9Ma, in Ypresian stage). Data source: Agnini et al., 2007, fig. 9
First occurrence (base): in mid part of NP8 zone (50% up, 58Ma, in Thanetian stage). Data source: Agnini et al., 2006, fig. 9

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 backmanii, synonyms included - Discoaster backmanii; space-time plot :: Samples map :: Parent: D. nodifer group

    References:

    Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007). High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: Implications for calcareous nannoplankton evolution. Marine Micropaleontology. 64: 215-248. gs

    Agnini, C., Fornaciari, E. & Raffi, I. (2008). Three new species of calcareous nannofossil from Late Palaeocene and Early Eocene assemblages (Ocean Drilling Program Site 1262, Walvis Ridge, SE Atlantic Ocean). Journal of Nannoplankton Research. 30(1): 51-56. gs

    Monechi, S. (1985). Campanian to Pleistocene calcareous nannofossil stratigraphy from the Northwest Pacific Ocean, Deep Sea Drilling Project Leg 86. Initial Reports of the Deep Sea Drilling Project. 86: 301-336. gs

    Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs


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    Discoaster backmanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=448 Go to Archive.is to create a permanent copy of this page - citation notes



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