Cryptococcolithus


Classification: ntax_cenozoic -> Coccolithales -> Calcidiscaceae -> Cryptococcolithus
Sister taxa: Calcidiscus, Hayaster, Oolithotus, Umbilicosphaera, Cryptococcolithus, Hayella

Daughter taxa (time control age-window is: 0-800Ma)
Cryptococcolithus mediaperforatus
Elliptical, medium sized placolith. Central-area with coarse grill clearly visible in LM (non-birefringent but easily seen in phase contrast). Proximal shield is birefringent but thin, and often detached, so coccolith is characteristically dark in XPL
Cryptococcolithus sp.
Specimens which cannot be assigned to established species

Taxonomy:

Citation: Cryptococcolithus Gartner, 1992
Rank: Genus
Type species: Cryptococcolithus takayamae Gartner, 1992. (= subj. j. syn ofBirkelundia mediaperforata Varol1991)

Distinguishing features: Coccoliths elliptical, grill in central area

Farinacci & Howe catalog pages: Cryptococcolithus *


Morphology: Placolith coccoliths with Calcidiscus type structure but with thin proximal shield and so showing very low birefringence, with grill in central area.

Search data:
TagsLITHS: placolith, elliptical, CA: grill, vacant,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
MetricsLith size: 5->8µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Never abundant but widespread.
Last occurrence (top): near top of Messinian Stage (86% up, 5.6Ma, in Messinian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Burdigalian Stage (32% up, 19Ma, in Burdigalian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Gartner, S. (1992a). Miocene nannofossil chronology in the North Atlantic, DSDP Site 608. Marine Micropaleontology. 18: 307-331. gs

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


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Cryptococcolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=399 Go to Archive.is to create a permanent copy of this page - citation notes



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