Helicosphaera HOL ponticuliferus type


Classification: Coccolithophores -> Holococcoliths -> flat-topped -> Helicosphaera HOL -> Helicosphaera HOL ponticuliferus type
Sister taxa: H. HOL catilliferus type, H. HOL confusus type, H. HOL dalmaticus type, H. HOL ponticuliferus type,

Taxonomy:

Citation: Helicosphaera HOL ponticuliferus type informal
Rank: Form
Basionym: Corisphaera ponticulifera Kamptner 1941
Synonyms:
Notes & discussion: Nomenclature here follows Young & Bown (2014)

Distinguishing features: Liths with two depressions, extending to proximal surface and separated by a bridge surmounted by a boss.

Farinacci & Howe catalog pages: Corisphaera ponticulifera *


Morphology remarks: The crystalites are in rhombohedral array but it is much less uniform than in Helicosphaera HOL catilliferus type with the rhombohedra tending to be aligned with their longer axis parallel to the edge of coccolith. In LM this results in discrete blocks being present at the ends of the coccolith.

Size: disk 6-9 crystallites high

Biology & life-cycles: Unambiguous combination coccosphere with H. wallichii observed by Couapel et al. (2009)

See also: Helicosphaera wallichii ;

Search data:
TagsLITHS: holococcolith, H: disk-like, elliptical, RIM: H: base flangeless, H: tube (Holos), CA: H: distal-cover, H: distal-cover-flat, H: fabric-rhomboid, pores, process, bar, PROCESS: boss,
CSPH: spherical, equant, monomorphic, V-UNITS: none, R-UNITS: all, R-prominent, DETAILS: blocks (holos),
MetricsLith size: 2.4->3.2µm; Segments: 1->3; Coccosphere size: 9->12µm; Liths per sphere: 40->80
Sources: csph size from illustrated specimens;
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:

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

    References:

    Couapel, M. J. J., Beaufort, L. & Young, J. R. (2009). A new Helicosphaera - Syracolithus combination coccosphere (Haptophyta) from the Western Mediterranean sea. Journal of Phycology. 45(4): 914-916. gs

    Kamptner, E. (1941). Die Coccolithineen der Südwestküste von Istrien. Annalen des Naturhistorischen Museums in Wien. 51: 54-149. gs

    Kamptner, E. (1954). Untersuchungen über den Feinbau der Coccolithen. Anzeiger. Österreichische Akademie der Wissenschaften. Mathematische-Naturwissenschafliche Klasse. Wien. 87: 152-158. gs

    Kleijne, A. & Jordan, R. W. (1990). Proposed changes to the classification system of living coccolithophorids II. INA Newsletter. 12(1): 13-. gs

    Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. 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


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    Helicosphaera HOL ponticuliferus type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-4-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=666 Go to Archive.is to create a permanent copy of this page - citation notes



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