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 |
Taxonomy:
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:Tags | LITHS: holococcolith, elliptical, hollow, CROSS-POLARS: R-prominent, |
Metrics | Lith size: 0.8->1.6µm; Coccosphere size: 5->8.5µm; |
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. gsReferences:
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Zygosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-4-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1525 Go to Archive.is to create a permanent copy of this page - citation notes |