Nannotax3 - ntax_cenozoic - Cyclagelosphaera Nannotax3 - ntax_cenozoic - Cyclagelosphaera


Classification: ntax_cenozoic -> Mesozoic Survivors -> Watznaueriaceae -> Cyclagelosphaera
Sister taxa: Cyclagelosphaera, Tergestiella, Watznaueria

Daughter taxa (time control age-window is: 0-800Ma)
Cyclagelosphaera alta
Cyclagelosphaera with central-plug-forming inner tube cycle that forms a raised conical structure.
Cyclagelosphaera colorata
Large (8-11 µm) circular to sub-circular, with closed central area
Cyclagelosphaera margerelii
Cyclagelosphaera with closed central area.
Cyclagelosphaera reinhardtii
Cyclagelosphaera with central-plug-forming inner tube cycle that is raised above shield level, forming a raised conical structure.
Cyclagelosphaera rotaclypeata
Cyclagelosphaera with relatively wide central area filled with radial elements.
Cyclagelosphaera sp.
Specimens which cannot be assigned to any established species


Citation: Cyclagelosphaera Noël, 1965
taxonomic rank: Genus
Type species: Cyclagelosphaera margerelii Noël, 1965

Distinguishing features:
Parent taxon (Watznaueriaceae): Placoliths or modified placoliths with R-unit well developed, forming proximal and distal shield elements with opposite senses of imbrication; the V-unit typically forms a narrow distal cycle near the inner edge of the shield. Central-area structures are typically disjunct. Birefringent LM image, in which the V-unit cycle appears only as a thin, dark line.
This taxon: Circular watznaueriacean placolith coccoliths.

Farinacci & Howe catalog pages: Cyclagelosphaera *

Search data:
LITHS: placolith, circular, CA: ca_conjunct,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 4->8µm; Liths per sphere: 11->13
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Cyclagelosphaera is a common genus in the Late Jurassic and Early Cretaceous, rarer in the Late Cretaceous.
Last occurrence (top): at top of NP10 zone (100% up, 54.2Ma, in Ypresian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NJ11 zone (165.71-168.69Ma, base in Bajocian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:


Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O

Noël, D. (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Éditions du Centre National de la Recherche Scientifique, Paris. 1-209. gs


Cyclagelosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-6-2024

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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