Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Kilwalithus -> Kilwalithus cribrum
Sister taxa: K. cribrum
- Bown 2010 pl4-fig20.JPG
- Bown 2010 pl4-fig19.JPG
Citation: Kilwalithus cribrumBown, 2010Rank: SpeciesTaxonomic 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 *
The morphological data given here can be used on the advanced search page. See also these notes
|Tags||LITHS: placolith, elliptical, CA: ca_disjunct, grill, vacant, |
CSPH: equant, monomorphic,
|Metrics||Lith size: 2->4µm; |
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:
- 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: Kilwalithus
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