Discosphaera tubifera


Classification: Coccolithophores -> Syracosphaerales -> Rhabdosphaeraceae -> Discosphaera -> Discosphaera tubifera
Sister taxa: D. jerkovici, D. tubifera, D. sp.,

Distinguishing features: Trumpet width much greater than basal width.


Taxonomy:

Citation: Discosphaera tubifera (Murray & Blackman 1898) Ostenfeld, 1900
Rank: Species
Basionym: Rhabdosphaera tubifera Murray & Blackman 1898
Synonyms: Discosphaera thomsoni Ostenfeld, 1899
Rhabdosphaera prijedorensis Jerkovic (1971) - Miocene fossil specimen [my interpretation - JRY 2015]

Farinacci & Howe catalog pages: Discosphaera thomsoni * Discosphaera tubifer * Rhabdosphaera prijedorensis * Rhabdosphaera tubifer *

Distinguishing features: Trumpet width much greater than basal width.


Morphology remarks: Extant coccolithophore: The only described species of Discosphaera; characterised by monomorphc coccosphere with all coccoliths bearing trumpet-like protrusions (see also generic description). 

Crystallography: as in most Rhabdosphaeraceae the column of the process is formed of R-units with slightly downward pinting c-axes. In conical upper part the c-axes remain perpendicular to the surface and so are progressively rotated downward, until at the rim they are directed vertically. So, coccospheres show strongly radial c-axis orientations in the outermost part.

Ecology & Biogeography: Common in oligotrophic surface waters. a characteristic species of the sub-tropical gyres.

Search data:
TagsLITHS: planolith, elliptical, CA: grill, PROCESS: flaring, open distally, spine,
CSPH: spherical, monomorphic, V-UNITS: calyx, R-UNITS: column, DETAILS: ca_disjunct,
MetricsLith size: 3->8µm; Coccosphere size: 12->20µm; Liths per sphere: 35->70
Sources: csph & lith length from illustrated specimens & Kahn & Aubry 2006; csph data from Cros & Fortuño 2003;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Never common but specimens occur consistently in well-preserved sub-tropical sediments. Usually the base is detached but appearance of trumpet-like processes is distinctive in LM (see images).
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within NN11 zone (5.59-8.29Ma, base in Tortonian stage). Data source: Young 1998

Plot of occurrence data:

References:

Murray, G. & Blackman, V.H., (1898). On the nature of the Coccospheres and Rhabdospheres. Philosophical Transactions of the Royal Society of London (B), 190(1): 427-441.

Young, J.R., (1998). Neogene. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265.


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Discosphaera tubifera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2018

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Go to Archive.is to create a permanent copy of this page - citation notes



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