Nannotax3 - ntax_cenozoic - Cyclagelosphaera colorata

Nannotax3 - ntax_cenozoic - Cyclagelosphaera colorata Nannotax3 - ntax_cenozoic - Cyclagelosphaera colorata

Cyclagelosphaera colorata

Classification: ntax_cenozoic -> Mesozoic Survivors -> Watznaueriaceae -> Cyclagelosphaera -> Cyclagelosphaera colorata
Sister taxa: C. alta, C. colorata, C. margerelii, C. reinhardtii, C. rotaclypeata, C. sp.

Bown et al 2023 pl1 20.jpg
Bown et al 2023 pl1 22.jpg
Bown et al 2023 pl1 23.jpg
Bown et al 2023 pl1 19.jpg
Bown et al 2023 pl1 21.jpg

Taxonomy:

Citation: Cyclagelosphaera colorata Bown, Kim & Gibbs 2023

taxonomic rank: species

Distinguishing features:
Parent taxon (Cyclagelosphaera): Circular watznaueriacean placolith coccoliths.
This taxon: Large (8-11 µm) circular to sub-circular, with closed central area

Farinacci & Howe catalog pages: C. colorata *

Morphology:

Diagnosis: Large, circular to subcircular (8–11 μm) watznauaerid with an indistinct but diagnostic low central plug and overall yellow-orange birefringence. Differentiation: Distinguished from other species of Cyclagelosphaera (and Watznaueria) by its large size, yellow-orange birefringence colours, and unusual central plug structure. [Bown et al 2023]

NB Most specimens have distinctly elliptical central areas and resemble a large W. barnesiae with a wide rim, but, although W.barnesiae is very abundant in the Cretaceous, it is rarely larger than about 9µm (see Gollain et al 2019) [my interpretation - JRY 2024]

Ecology & Biogeography

Search data:

LITHS: placolith, elliptical, circular, CA: closed,
CSPH: monomorphic, CROSS-POLARS: R-prominent,

Lith size: 8->11µm;
Data source notes: Bown et al. 2023

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: This species has a short stratigraphic range in the Danian (Zone NP1–2; +112 to +843 kyr after the K/Pg boundary) and is likely a descendant of Cyclagelosphaera reinhardtii. [Bown et al. 2023]
Last occurrence (top): within NP2 zone (64.81-65.47Ma, top in Danian stage). Data source: Bown et al. 2023
First occurrence (base): within NP1 zone (65.47-66.04Ma, base in Danian stage). Data source: Bown et al. 2023

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Cyclagelosphaera

References:

Bown, P. R., Kim, H. & Gibbs, S. J. (2023). Danian calcareous nannofossil evolution and taxonomy with focus on sites from the North Atlantic Ocean (IODP Expedition 342, Sites U1403 and U1407). Journal of Nannoplankton Research. 41(2): 110-157. gs O

Gollain, B., Mattioli, E., Kenjo, S., Bartolini, A. & Reboulet, S. (2019). Size patterns of the coccolith Watznaueria barnesiae in the lower Cretaceous: Biotic versus abiotic forcing. Marine Micropaleontology. 152: 1-11. gs

Cyclagelosphaera colorata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-10-2024

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1808 Go to Archive.is to create a permanent copy of this page - citation notes

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