Zygosphaera


Classification: Coccolithophores -> Holococcoliths -> flat-topped -> Zygosphaera
Sister taxa: Calyptrosphaera -flat, Coronosphaera HOL type, Helicosphaera HOL, Poricalyptra, Zygosphaera,

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

Taxonomy:

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

Distinguishing features: 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, H: cavate, H: disk-like, elliptical, RIM: H: tube (Holos), V-UNITS: none, R-UNITS: all, c-str, rim,
MetricsLith size: 0.8->1.6µm; Coccosphere size: 5->8.5µm;
Sources:
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 stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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


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Zygosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-7-2019

Taxon Search:
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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1525 Go to Archive.is to create a permanent copy of this page - citation notes



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