Helladosphaera cornifera


Classification: ntax_cenozoic -> Holococcoliths -> bridged -> Helladosphaera -> Helladosphaera cornifera
Sister taxa: H. cornifera, H. pienaarii, H. vavilovii, H. sp.

Taxonomy:

Citation: Helladosphaera cornifera (Schiller 1913) Kamptner, 1937
Rank: Species
Basionym: Syracosphaera cornifera Schiller 1913

Distinguishing features: BCs simple tube, ca 6 crystallites high, no basal flange or baseplate; bridge asymmetrical, thin and high ending in weak leaf.
CFCs bridge extended into large pointed leaf, ca. 2.5 µm high.

Farinacci & Howe catalog pages: S. cornifera *


Size: Liths ca. 1.5 µm long.


Biology & life-cycles: Single possible combination coccospheres have been shown by Cros et al. (2000) with Syracosphaera nodosa and by Young & Geisen (2002) with Syracosphaera noroitica. Neither of these are convicing so the nomenclature has not been revised.

Search data:
TagsLITHS: holococcolith, elliptical, hollow, CA: bar,
CSPH: equant, elongated, CFC, CROSS-POLARS: R-prominent,
MetricsLith size: 1->1.6µm; Coccosphere size: 6->11µm; Liths per sphere: 50->120
Data source notes: 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 "Holocene" stage). Data source: [JRY rough estimate]

Plot of occurrence data:

References:

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

Cros, L., Kleijne, A., Zeltner, A., Billard, C. & Young, J. R. (2000b). New examples of holococcolith-heterococcolith combination coccospheres and their implications for coccolithophorid biology. In, Young, J. R., Thierstein, H. R. & Winter, A. (eds) Nannoplankton ecology and palaeocology, Proceedings of the INA7 conference, Puerto Rico, February 2002. Marine Micropaleontology. 39(1-4): 1-34. gs

Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology. 17: 1-76. gs

Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs

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

Schiller, J. (1913). Vorläufige Ergebnisse der Phytoplankton-Untersuchungen auf den Fahrten S.M.S. Najade in der Adria 1911/12. I. Die Coccolitophoriden. Sitzungberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Klasse. 122(1): 597-617. gs V O

Yang, T-N., Wei, K-Y. & Gong G-C. (2001). Distribution of coccolithophorids and coccoliths in surface ocean off northeastern Taiwan. Botanical Bulletin of the Academia Sinica. 42: 287-302. gs

Young, J. R. & Geisen, M. (2002). Xenospheres – associations of coccoliths resembling coccospheres. Journal of Nannoplankton Research. 24(1): 27-35. gs V O

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 V O


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Helladosphaera cornifera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-4-2021

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