Craticullithus cassus


Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Craticullithus -> Craticullithus cassus
Sister taxa: C. cancellus, C. clathrus, C. lamina, C. cassus, C. sp.,

Taxonomy:

Citation: Craticullithus? cassus (Bown, 2005) Bown, 2010
Rank: Species
Basionym: Cruciplacolithus cassus Bown 2005
Synonyms: Cruciplacolithus cassus
Notes & discussion: As this species has a complex central area grill and coccolithacean rim it is tentatively placed into the genus Craticullithus.

Distinguishing features: Medium sized, bicyclic placolith with dark outer-cycle, slightly brighter inner cycle and relatively wide central-area (approximately same width as shields). In SEM a central-area net is evident.

Farinacci & Howe catalog pages: Cruciplacolithus cassus *


Morphology remarks: The distal shield appears to be bicyclic: the outer cycle elements are joined along distinctly kinked sutures; the inner cycle appears to have a smooth upper surface and the sutures are less clear but are broadly radial. The central area is spanned by a perforate plate formed from small elements.

Search data:
TagsLITHS: placolith, elliptical, CA: plate,
CSPH: spherical, monomorphic, V-UNITS: distal shield, px-tube, R-UNITS: c-str, ds-tube, prox shield, DETAILS: rim-bicyclic, isogyres oblique,
MetricsLith size: 5->8┬Ám;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP11 zone (53.70-54.17Ma, top in Ypresian stage). Data source: Bown, 2010
First occurrence (base): within NP7 zone (58.70-58.97Ma, base in Thanetian stage). Data source: Bown, 2010

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Craticullithus

    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

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

    Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs

    Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs


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    Craticullithus cassus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=373 Go to Archive.is to create a permanent copy of this page - citation notes



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