Coccolithus pelagicus subsp. braarudii HOL


Classification: Coccolithophores -> Holococcoliths -> tubeless -> flat (coccolithaceae HOLs) -> Coccolithus pelagicus subsp. braarudii HOL
Sister taxa: C. leptoporus subsp. leptoporus HOL, C. pelagicus subsp. braarudii HOL, C. pelagicus subsp. pelagicus HOL,

Distinguishing features: Disk with single layer of crystallites arranged in radial strings


Taxonomy:

Citation: Coccolithus pelagicus subsp. braarudii (Gaarder 1962) Geisen et al., 2002 HOL
Rank: Form
Basionym: Crystallolithus braarudii Gaarder 1962
Synonyms:

Farinacci & Howe catalog pages: Crystallolithus braarudi + *

Distinguishing features: Disk with single layer of crystallites arranged in radial strings


Morphology remarks: Like C. p. pelagicus HOL but liths with discontinuous cover, central ring of elements connected to rim by spoke-like strings of crystallites; rim two crystallites high. Not all specimens show this morphology well and separation from C. p. pelagicus is not easy in this phase.
From the SEM appearance one might predict a rather oblique c-axis orientation but when coccospheres are examined in LM the coccoliths behave as if formed of vertically oriented calcite. [my obs - JRY 2017]

Biology & life-cycles: Life-cycle association with C. pelagicus ssp. braarudii HET (larger, temperate water, morphotype) is supported by culture observations and biogeography (Geisen et al. 2002).

Search data:
TagsLITHS: holococcolith, H: disk-like, elliptical, CA: H: fabric-rhomboid,
CSPH: spherical, monomorphic, V-UNITS: all, c-str, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 2->3µm; Coccosphere size: 13->20µm;
Sources: lith size from OD; csph size from illustrated specs
The morphological data given here can be used on the advanced search page. See also these notes

See also: Coccolithus pelagicus subsp. braarudii ;

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: [JRY rough estimate]

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: Coccolithus pelagicus subsp. braarudii HOL, synonyms included - Coccolithus pelagicus braarudii hol; Coccolithus pelagicus f. braarudii; Coccolithus braarudii; Coccolithus pelagicus subsp. braarudii HOL; space-time plot :: Samples map :: Parent: flat (coccolithaceae HOLs)

    References:

    Gaarder, K.R. (1962). Electron Microscope Studies on Holococcolithophorids. Nytt Magasin for Botanikk, 10: 35-51. GS

    Geisen, M.; Billard, C.; Broerse, A.T.C.; Cros, L.; Probert, I. & Young, J.R. (2002). Life-cycle associations involving pairs of holococcolithophorid species: intraspecific variation or cryptic speciation? European Journal of Phycology, 37: 531-550. GS

    Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology, 17: 1-76. GS


    nannotaxlogo400px

    Coccolithus pelagicus subsp. braarudii HOL compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-5-2019

    Taxon Search:
    Advanced Search

    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=334 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (0)

    No comments yet. Be the first!

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics