INA16 Athens - September 2017

Syracosphaera halldalii


Ancestry: Coccolithophores -> Syracosphaerales -> Syracosphaeraceae -> Syracosphaera -> SY molischii gp -> halldalii type -> Syracosphaera halldalii
Sister taxa: S. halldalii, S. protrudens,

Short diagnosis: BC flange smooth protrusions short or absent


Taxonomy:

Citation: Syracosphaera halldalii Gaarder, in Gaarder & Hasle 1971 ex Jordan, 1994
Rank: Species
Synonyms:
Notes & discussion: This is the type species of Caneosphaera Gaarder in Gaarder & Heimdal 1977, it is normally combined in Syracosphaera following Jordan & Young (1990), but the consistent absence of XCs means reinstatement of the genus Caneosphaera may be justified.

Farinacci & Howe catalog pages: Syracolithus verruca israela *

Short diagnosis: BC flange smooth protrusions short or absent


Morphology remarks: BCs - with narrow distal flange; flanges well-separated by vertical sided tube; laths well-separated; low axial ridge formed of one or two laths. Short teeth protruding over central area from distal flange occur in some specimens. CFCs - with tall spine, quadrate section, blunt end.

Size: Coccospheres 5-20 µm; BCs 2-4 µm.

Biology & life-cycles: A combination coccosphere with the holococcolith Calyptrolithina divergens forma tuberosa 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: Calyptrolithina divergens - possible holococcolith stage;

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:

References:

Jordan, R.W. & Green, J.C., (1994). A check-list of the extant haptophyta of the world. Journal of the Marine Biological Association of the United Kingdom, 74: 149-174.

Jordan, R.W. & Young, J.R., (1990). Proposed changes to the classification system of living Coccolithophorids. International Nannoplankton Association Newsletter, 12(1): 15-18.

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

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Syracosphaera halldalii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-8-2017

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Maria Triantaphyllou (Greece)
Combination coccosphere with Calyptrolithina divergens var. tuberosa

TRIANTAPHYLLOU, M.V., DIMIZA, M.D.*, DERMITZAKIS, M.D., 2004. Syracosphaera halldalii and Calyptrolithina divergens var. tuberosa life-cycle association and relevant taxonomic remarks.
Micropaleontology 50 (1): 121-126.
https://www.researchgate.net/profile/Maria_Triantaphyllou/publications?sorting=newest&page=6"""
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Jeremy Young (UCL, UK)
very true - id like to see at least one more specimen but I will add some text on both pages and a link between them
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