Calyptrolithina divergens

Classification: Coccolithophores -> Holococcoliths -> convex -> Calyptrolithina divergens
Sister taxa: C. sphaeroidea HOL, S. pulchra HOL oblonga type, S. pulchra HOL pirus type, C. divergens, C. galea, C. sp. cf. heimdaliae, C. heimdaliae, C. radiata, Flosculosphaera, Gliscolithus,


Citation: Calyptrolithina divergens (Halldal & Markali 1955) Heimdal, 1982
Rank: Species
Basionym: Zygosphaera divergens Halldal & Markali 1955

Distinguishing features: Tube sharply separated from cover; cover with perforations

Farinacci & Howe catalog pages: Zygosphaera divergens + * , Zygosphaera divergens tuberosa *

Morphology remarks: BC tube flaring, about 5 crystallites high, tiered wall fabric, often with some perforations; basal flange; distal cover conical, recessed within tube, hexagonal mesh fabric.
CFC similar but distal cover with large pores at each end and extended into bridge.

Size: Liths ca. 2 µm long

Biology & life-cycles: A combination coccosphere with the heterococcolith Syracosphaera halldalii was recorded by Triantaphyllou et al. 2004. Only a single coccosphere was observed, but it is well preserved and does not look to be an artefact, so it is likely this combination will be confirmed.

See also: Syracosphaera halldalii - possible heterococcolith stage;

Search data:
TagsLITHS: holococcolith, H: cavate, H: disk-like, elliptical, hollow, RIM: flange-proximal, H: tube (Holos), CA: H: distal-cover, H: distal-cover-domal, closed, PROCESS: hollow,
CSPH: ovoid, spherical, equant, elongated, CFC, CFC+bridge, CFC-higher, polymorphic, V-UNITS: ds-surface, V-prominent, R-UNITS: rim, R-prominent,
MetricsLith size: 1.5->2.6µm; Coccosphere size: 8->12µm; Liths per sphere: 35->125
Sources: morphom data from Yang & Wei (2003), Cros & Fortuño (2002) & Kleijne 1991
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 No known fossil record modern (0.00-0.00Ma, base in stage). Data source: [JRY rough estimate]

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: convex


    Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs :: ::

    Halldal, P. & Markali, J. (1955). Electron microscope studies on coccolithophorids from the Norwegian Sea, the Gulf Stream and the Mediterranean. Avhandlinger utgitt av det Norske Videnskapsakademi i Oslo. Matematisk-Naturvidenskapelig Klasse. 1955(1): 1-30. gs :: ::

    Heimdal, B. R. & Gaarder, K. R. (1980). Coccolithophorids from the northern part of the eastern central Atlantic I. Holococcolithophorids. “Meteor” Forschungsergebnisse, Reihe D, Biologie. 32: 1-14. gs :: ::

    Heimdal, B. R. (1982). Validation of the names of some species of Zygosphaera Kamptner. INA Newsletter. 4: 52-56. gs :: view :: open

    Jordan, R. W., Kleijne, A. & Heimdal, B. R. (1993). Proposed changes to the classification system of coccolithophorids. III. INA Newsletter. 15(1): 18-22. gs :: view :: open

    Reid, F. M. H. (1980). Coccolithophorids of the North Pacific Central Gyre with notes on their vertical and seasonal distribution. Micropaleontology. 26(2): 151-176. gs :: ::

    Triantaphyllou, M., Dimiza, M. D. & Dermitzakis, M. (2004a). Syracosphaera halldalii and Calyptrolithina divergens var. tuberosa life-cycle association and relevant taxonomic remarks. Micropaleontology. 50(suppl. 1): 121-126. 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 :: view :: open


    Calyptrolithina divergens compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-5-2020

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