Nannotax3 - ntax_main - Cyclicargolithus bukryi Nannotax3 - ntax_main - Cyclicargolithus bukryi

Cyclicargolithus bukryi

Variant: Cyclicargolithus bukryi is regarded here as a variant of Cyclicargolithus floridanus.
I.e. It is a subjective junior synonym. Some workers many find it useful for some studies (e.g. experienced biostratigraphers working with abundant, well preserved material), but for most purposes differentiating it is not reccomended. Please do use the comments section at the bottom of this page if you wish to discuss this interpretation


Classification: ntax_main -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> C. floridanus group -> Cyclicargolithus floridanus -> Cyclicargolithus bukryi
Sister taxa: C. bukryi


Taxonomy:
Citation: Cyclicargolithus bukryi Wise 1973
Taxonomic rank: species/variant
Taxonomic discussion:

This taxon has not been widely used but Boesiger et al. (2017) record that it is a valuable marker in the Gulf of Mexico - with 5 abundance based events being used.
Varol & Bowman 2024 illustrate a specimen of Reticulofenestra bukryi Wise 1973, but the specimen they illustrate is larger and more elliptical than would fit in the species concept of Boesiger et al 2017.


Synonyms:

Distinguishing features:
Parent taxon (Cyclicargolithus floridanus): Coccoliths circular to sub-circular with small central-area, <11µm in width.
This taxon: Small (3-6 µm), sub-circular with broad central opening (ca 20-25% of coccolith width)

Search data:
LITHS: placolith, circular, CA: ca_conjunct, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 3->6µm;
Data source notes: Boesiger et al 2017
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes:

In the Gulf of Mexico there is an acme of the species low in NN5 (Boesiger et al. 2017). Vrol (2025) records the species as confined to NN5 but Boesiger et al (2017) state that it has its FO within NN45.


Last occurrence (top): in lower part of NN6 zone (20% up, 13.2Ma, in Serravallian stage). Data source: Boesiger et al 2017
First occurrence (base): within NN4 zone (14.91-17.95Ma, base in Burdigalian stage). Data source: Boesiger et al 2017

Plot of occurrence data:

References:

Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E. & Blair, S. A. (2017). Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. Journal of Nannoplankton Research. 37(2-3): 145-175. gs O

Denne, R. A. (2008). Utilizing abundance changes of new and non-standard calcareous nannofossil taxa to increase biostra- tigraphic resolution in expanded continental margin deposits: Examples from the Middle and Lower Miocene of the Gulf of Mexico. Transactions of the Gulf-Coast Association of Geological Societies. 58: 227-239. gs

Varol, O. (2025). A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222. gs

Wise, S. W. (1973). Calcareous nannofossils from cores recovered during Leg 18, Deep Sea Drilling Project: biostratigraphy and observations on diagenesis. Initial Reports of the Deep Sea Drilling Project. 18: 569-615. gs O

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Cyclicargolithus bukryi compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2026

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