Nannotax3 - ntax_cenozoic - Zygosphaera


Classification: ntax_cenozoic -> Holococcoliths -> flat-topped -> Zygosphaera
Sister taxa: Calyptrosphaera -flat, Helicosphaera HOL, Poricalyptra, S. mediterranea HOL type, Zygosphaera

Daughter taxa (time control age-window is: 0-800Ma)
Syracosphaera bannockii HOL
BCs with transverse ridge one crystallite wide.
CFCs with central opening and well-developed triangular leaf.
Zygosphaera amoena
BCs with longitudinal ridge or mound,
Zygosphaera marsilii
Like Coronosphaera mediterranea HOL hellenica type but with three or four well-separated concentric rings of crystallites and low transverse ridge
Zygosphaera sp.
Specimens which cannot be assigned to established species


Citation: Zygosphaera Kamptner, 1936
Rank: Genus
Type species: Zygosphaera hellenica Kamptner, 1937 - subsequent designation by Loeblich & Tappan 1963

Distinguishing features:
Parent taxon (flat-topped): Holococcoliths with tube, covered distally by a flat cover
This taxon: Dimorphic; liths semi-solid - formed of concentric rings of crystallites.
BCs flat topped with node or ridge on distal surface, rather than a true bridge.
CFCs similar with transverse bridge or leaf.

Farinacci & Howe catalog pages: Zygosphaera + *

Search data:
TagsLITHS: holococcolith, elliptical, hollow, CROSS-POLARS: R-prominent,
MetricsLith size: 0.8->1.6µm; Coccosphere size: 5->8.5µm;
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:


Kamptner, E. (1936). Über die Coccolithineen der Südwestküste von Istrien. Anzeiger der (Kaiserlichen) Akademie der Wissenschaften, Mathematische-Naturwissenschaftliche Klasse, Wien. 73: 243-247. gs


Zygosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2021

Taxon Search:
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Short stable page link: Go to to create a permanent copy of this page - citation notes

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