Helladosphaera


Classification: ntax_cenozoic -> Holococcoliths -> bridged -> Helladosphaera
Sister taxa: Corisphaera, Helladosphaera, Homozygosphaera, Poritectolithus, S. anthos HOL

Daughter taxa (time control age-window is: 0-800Ma)
Helladosphaera cornifera
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.
Helladosphaera pienaarii
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
Helladosphaera vavilovii
BCs like Homozygosphaera arethusae but bridge triangular in profile, terminated by ridge parallel to long axis of coccolith; open wall structure.
CFCs are well differentiated, helladoliths
Helladosphaera sp.
Specimens which cannot be assigned to established species

Taxonomy:

Citation: Helladosphaera Kamptner, 1937
Rank: Genus
Type species: Syracosphaera cornifera Schiller, 1913, fixed by monotypy in Kamptner, 1937

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

Farinacci & Howe catalog pages: Helladosphaera *

Search data:
TagsLITHS: holococcolith, elliptical, hollow, CA: bar,
CSPH: tubular, elongated, CFC, CROSS-POLARS: R-prominent, T-prominent,
MetricsLith size: 1->1.8µm; Coccosphere size: 6->11µm;
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: Total of range of species in this database
First occurrence (base): at top of No known fossil record modern (100% up, 0Ma, in "Holocene" stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Kamptner, E. (1937b). Neue und bemerkenswerte Coccolithineen aus dem Mittelmeer. Archiv für Protistenkunde. 89: 279-316. gs


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Helladosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-4-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=706 Go to Archive.is to create a permanent copy of this page - citation notes



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