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,

Taxonomy:

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

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

Farinacci & Howe catalog pages: C. braarudi + *


Morphology: 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).

See also: Coccolithus pelagicus subsp. braarudii ;

Search data:
TagsLITHS: holococcolith, elliptical, CA: closed,
CSPH: equant, monomorphic, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 2->3µm; Coccosphere size: 13->20µm;
Data source notes: 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

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:

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. (2002a). Life-cycle associations involving pairs of holococcolithophorid species: intraspecific variation or cryptic speciation?. European Journal of Phycology. 37: 531-550. gs V O

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

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue. 1: 1-132. gs V O


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Coccolithus pelagicus subsp. braarudii HOL compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-10-2020

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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



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