arrayname: original
Distinguishing features:
Parent taxon (Calyculus): High, broad, flaring distal-shield composed of radial, non-imbricating elements, and a proximal-shield which is often reduced to a simple, narrow cycle of elements; central-area structures are highly variable, including numerous bars, concentric structures, nets and grills.
This taxon: Broadly elliptical, with 8-10 radial bars in central area.
Taxonomy:
The three described species appear very similar, so it probably is not useful to separate them, given this the senior synonym is Proculithus charlottei but this should be recombined into Calyculus. [my interpretation - JRY 2021]
NB The correct spelling of the name is charlottei, with one i, - see also discussion on the catalog page.
Farinacci & Howe catalog pages: C. subcircularis * , C. elongatus * , P. charlotteii *
Distinguishing features:
Parent taxon (Calyculus): High, broad, flaring distal-shield composed of radial, non-imbricating elements, and a proximal-shield which is often reduced to a simple, narrow cycle of elements; central-area structures are highly variable, including numerous bars, concentric structures, nets and grills.
This taxon: Broadly elliptical, with 8-10 radial bars in central area.
Search data:
LITHS: placolith, elliptical, CA: grill, CSPH: equant, |
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): within Oxfordian Stage (154.78-161.50Ma, top in Oxfordian stage). Data source: Grun & Zweili 1980
First occurrence (base): within Oxfordian Stage (154.78-161.50Ma, base in Oxfordian stage). Data source: Grun & Zweili 1980
Plot of occurrence data:
Grün, W. & Zweili, F. (1980). Das kalkige Nannoplankton der Dogger-Malm-Grenze im Berner Jura bei Liesberg (Schweiz). Jahrbuch der Geologischen Bundesanstalt. 123: 231-341. gs Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gs O Zweili, F. (1989). Fossile Coccolithophoriden aus dem Weissensteingebiet. Mitteilungen / Naturforschende Gesellschaft des Kantons Solothurn. 34: 199-213. gs OReferences:
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Calyculus - late Jurassic compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11405 Go to Archive.is to create a permanent copy of this page - citation notes |
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