Nannotax3 - ntax_cenozoic - Coronocyclus mesostenos

Coronocyclus mesostenos

Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Coronocyclus -> Coronocyclus mesostenos
Sister taxa: C. nitescens, C. mesostenos, C. baileyi, C. lordii, C. sp.

Muller74walb-pl3-28.JPG
Boesiger et al 2017 pl09 06.JPG
Boesiger et al 2017 pl09 05.JPG
Young1998_pl05_fig15.JPG
daGama_and_Varol2013-pl4-fig04.JPG
daGama_and_Varol2013-pl4-fig03.JPG
Muller74walb-pl3-29.JPG
Young1998_pl05_fig14.JPG
deKaenelVilla96pl05 f22-23.JPG
deKaenelVilla96pl05 f24-27.JPG

Taxonomy:

Citation: Coronocyclus mesostenos de Kaenel & Boesiger in Boesiger et al. 2017

Rank: species

Synonyms:

Coronocyclus nitescens elliptical Young 1998
Coronocyclus baileyi da Gama & Varol 2013 pro parte pl.4 figs.3-4 non pl.5 figs.13-15. Boesiger et al. (2017) noted that the type specimens of C. baileyi have unusually narrow rims, and are described from outside the normal range for elliptical Coronocyclus. They proposed C. mesostenos as an alternate name for the more typical specimens.

Distinguishing features: Ellptical Coronocyclus with wide central area and narrow to broad shield.

Farinacci & Howe catalog pages: C. mesostenos *

Search data:

Tags	LITHS: placolith, elliptical, CA: vacant, CSPH: monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 0->0µm;

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

Geological Range:
Notes: Young (1998) recorded elliptcal Coronocyclus as characteristic of the top of the range of Coronocylus, NN5-6, however Beosiger et al. report it as occuring back to the Eocene. Most illustrated speciemns are from NN4-6.
Last occurrence (top): within NN6 zone (11.90-13.53Ma, top in Serravallian stage). Data source: Boesiger et al 2017; Young 1998
First occurrence (base): within Lutetian Stage (41.15-47.84Ma, base in Lutetian stage). Data source: Boesiger et al 2017

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: Coronocyclus

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 V O

da Gama, R. O. B. P. & Varol, O. (2013). New Late Oligocene to Miocene Species. Journal of Nannoplankton Research. 33(1): 1-12. gs V O

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs V O

Müller, C. (1974c). Nannoplankton aus dem Mittel-Miozän von Walbersdorf (Burgenland). Senckenbergiana Lethaea. 55: 389-405. gs

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O