Nannotax3 - ntax_cenozoic - Helladosphaera pienaarii Nannotax3 - ntax_cenozoic - Helladosphaera pienaarii

Helladosphaera pienaarii

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


Citation: Helladosphaera pienaarii Norris, 1985
taxonomic rank: Species

Distinguishing features:
Parent taxon (Helladosphaera): Dimorphic; BCs with regular bridge.
CFCs with bridge extended into leaf (helladolith)

This taxon: BCs tube with basal flange; H-shaped set of septae rise from distal surface, forming bridge parallel to long axis. CFCs bridge extended into large leaf ca. 1.5 µm high

Farinacci & Howe catalog pages: H. pienaarii *

Liths ca. 2 µm long.

Search data:
LITHS: holococcolith, elliptical, hollow, CA: bar,
CSPH: tubular, elongated, CFC, CROSS-POLARS: R-prominent,
Lith size: 1->2µm; Segments: 9->16; Coccosphere size: 6->11µm; Liths per sphere: 70->130
Data source notes: lith size from Kleijne 1991; csph size from illustraed specimens; lith numbers from Yang & Wei 2003, range inferred from single estimate
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:


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

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

Norris, R. E. (1985). Indian Ocean nanoplankton. II. Holococcolithophorids (Calyptrosphaeraceae, Prymnesiophyceae) with a review of extant genera. Journal of Phycology. 21: 619-641. 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. S1: 1-132. gs


Helladosphaera pienaarii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2024

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