Kilwalithus cribrum


Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Kilwalithus -> Kilwalithus cribrum
Sister taxa: K. cribrum,

Taxonomy:

Citation: Kilwalithus cribrumBown, 2010
Rank: Species
Notes & discussion: The coccoliths have not been unequivocally observed in the LM, presumably because of their small size (~3 µm or less), but they have been frequently observed in SEM from the upper Paleocene and middle Eocene, often as intact coccospheres. In middle Eocene samples, the coccospheres are distinctly dimorphic with apical and antapical coccoliths that have long distal processes.

Distinguishing features: Very small, elliptical placolith coccoliths with central-areas spanned by a perforate net. The distal shield is bicyclic and the rim structure appears to be coccolithacean.

Farinacci & Howe catalog pages: K. cribrum *

Search data:
Tagsplacolith, elliptical, narrowly-elliptical, oblong, CA: grill, vacant,
CSPH: spherical, equant, monomorphic, DETAILS: ca_disjunct,
MetricsLith size: 2->4µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP15 zone (42.87-46.29Ma, top in Lutetian stage). Data source: Bown, 2010
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: Bown, 2010

Plot of occurrence data:

References:

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs V O

Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs V O

Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs V O


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Kilwalithus cribrum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-9-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=783 Go to Archive.is to create a permanent copy of this page - citation notes



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