Cyclagelosphaera


Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Cyclagelosphaera
Sister taxa: Bussonius, Cyclagelosphaera, Diazomatolithus, Lotharingius, Watznaueria, Ansulasphaera, Bibreviconus, Perchnielsenella,

Distinguishing features: Circular watznaueriacean coccoliths.


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
long ranging
Small to medium sized Cyclagelosphaera with closed central area.

mid-late Cretaceous
Cyclagelosphaera with central-plug-forming inner tube cycle that forms a raised conical structure.

Cyclagelosphaera with central-plug-forming inner tube cycle that forms a raised conical structure.

Cyclagelosphaera with relatively wide central area filled with radial elements.

Cyclagelosphaera with narrow distal shield and broad, elevated, mid-tube cycle.

Jurassic/Early Cretaceous
A large, concavo-convex species of Cyclagelosphaera (6-11 µm) having a broad, distal shield inner cycle and a small central perforation.

Medium to large Cyclagelosphaera with closed central area, small proximal shield, large elements, and indistinct V-units cycle.

Medium to large (6-10 µm) with, closed, elliptical central area 

Large (>9µm) Cyclagelosphaera with a closed central area.

Medium-sized Cyclagelasphaera with an open central area, equivalent in width to that of the shield width. Grill of rtoatedbars in well-preserved specimens 

Small to medium sized Cyclagelosphaera with central opening.

Large sized (8-9 µm) with small central opening and inconspicuous tube cycle.

Specimens not identified to species level

Taxonomy:

Citation: Cyclagelosphaera Noël, 1965
Rank: Genus
Type species: Cyclagelosphaera margerelii Noël, 1965.
Notes & discussion: Arguably a junior synonym of Tergestiella Kamptner 1941

Farinacci & Howe catalog pages: Cyclagelosphaera *

Distinguishing features: Circular watznaueriacean coccoliths.

Geological Range:
Notes: Last appearance was thought be in the early Eocene (e.g. Bybell & Self-Trail, 1995) but it has recently been shown to be extant by Hagino et al. (2015).  Some authors have claimed an earlier origination.
Last occurrence (top): in lower part of Ypresian Stage (22% up, 54.2Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Bajocian Stage (81% up, 168.7Ma, in Bajocian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

Bybell, L. M. & Self-Trail, J. (1995). Evolutionary, biostratigraphic and taxonomic study of calcareous nanofossils from a continuous Palaeocene-Eocene boundary section in New Jersey. US Geological Survey professional paper. 1554: 1-36. gs

Hagino, K. et al. (2015). Re-discovery of a “living fossil” coccolithophore from the coastal waters of Japan and Croatia. Marine Micropaleontology. 116(1): 28-37. gs

Kamptner, E. (1941). Die Coccolithineen der Südwestküste von Istrien. Annalen des Naturhistorischen Museums in Wien. 51: 54-149. gs

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


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Cyclagelosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-10-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10337 Go to Archive.is to create a permanent copy of this page - citation notes



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