Nannotax3 - ntax_Farinacci - Calcidiscaceae Nannotax3 - ntax_Farinacci - Calcidiscaceae

CATALOG - Calcidiscaceae


Folder trail: ntax_Farinacci -> C -> Calcidiscaceae
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Original descriptions of taxa - also emended descriptions for a few taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Current identification/main database link: Calcidiscaceae Young & Bown 1997

Compiled data

Citation: Calcidiscaceae Young & Bown 1997
Taxonomic rank: family
Described on page(s) : 41

Combinations:
  • Calcidiscaceae Young & Bown 1997 (basionym)

  • Original Description

    Diagnosis: Coccosphaerales constans ex coccolithis cum R-unitis no nisi in proximo scuto.

    Coccosphaerales consisting of coccoliths with R-units only in the proximal shield.

    Description: Dominant phase of life-cycle, non-motile with placolith heterococcoliths. V-unit forms the distal shield and tube, extending to the proximal surface. R-unit forms the proximal shield. As in the Coccolithaceae, growth occurs downward from the proto-coccolith ring which becomes embedded within the structure so that alternating Vand R-units are only visible on specimens where the proximal shield has broken off. Distal shield sutures typically show laevogyral curvature. The proximal shield is usually monocyclic with radial sutures; sometimes it is bicyclic due to the development of a lower layer, with elements showing strong dextral obliquity (in proximal view). The connection between the proximal and distal shields is weak and they frequently separate.

    Extra details from original publication
    Comments: These genera have previously been included within the Coccolithaceae but the distinctively different structure appears to warrant classification in a separate family. The cytology of Umbilicosphaera is described by Inouye & Pienaar (1984).

    References:

    Inouye, I. & Pienaar, R. N. (1984). New observations on the coccolithophorid Umbilicosphaera sibogae var. foliosa (Prymnesiophyceae) with reference to cell covering, cell structure and flagellar apparatus. British Phycological Journal. 19: 357-369. gs

    Young, J. R. & Bown, P. R. (1997). Cenozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 36-47. gs


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    Calcidiscaceae: Catalog entry compiled by <% compiler %>. Viewed: 10-9-2026

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