Calculites rosalyniae


Classification: Mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites rosalyniae
Sister taxa: C. favosus, C. anfractus, C. axosuturalis, C. obscurus, C. ovalis, C. rosalyniae, C. additus, C. cenomanicus, C. cyclops, C. juliae, C. maghredaswampensis, C. paulus, C. percernis, C. proscissus, C. turonicus, C. sarstedtensis, C. suturus, C. sp.,

Distinguishing features: Formed of 4 blocks like C. obscurus, but with a perforation in each block, and blocks go into extinction separately


Taxonomy:

Citation: Calculites rosalyniae Lees, 2007
Rank: Species

Farinacci & Howe catalog pages: Calculites rosalyniae *

Distinguishing features: Formed of 4 blocks like C. obscurus, but with a perforation in each block, and blocks go into extinction separately


Morphology remarks: "A small species of Calculites comprising four blocks divided by wavy sutures that form an H-shape. Each plate has a perforation towards the centre. The blocks appear to go into extinction separately. The lith appears similar at all angles of rotation in XPL. Differentiation: The new species is superficially similar to C. obscurus, but bears a perforation in each quadrant, and the extinction pattern is dissimilar." [Lees 2007]

Size: Holotype dimensions: L = 4.40μm, W = 3.08μm.

Search data:
TagsLITHS: holococcolith, elliptical, CA: pores, closed, R-UNITS: R-prominent, DETAILS: ca_conjunct, rim-unicyclic,
MetricsLith size: 4->5µm; Segments: 4->4;
Sources: holotype +/-0.5µm
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Maastrichtian Substage (69.91-72.05Ma, top in Maastrichtian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Late Campanian Substage (72.05-76.38Ma, base in Campanian stage). Data source: Lees 2007 (original description)

Plot of occurrence data:

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

    References:

    Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs

    Perez-Rodriguez, I., Lees, J. A., Larasoaña, J. C., Arz, J. A. & Arenillas, I. (2012). Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain. Cretaceous Research. 37: 100-126. gs

    nannotaxlogo400px

    Calculites rosalyniae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-2-2020

    Taxon Search:
    		Advanced Search

    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10177 Go to Archive.is to create a permanent copy of this page - citation notes
    Powered by Mikrotax taxonomy content management system developed by Jeremy Young


    Comments (0)

    No comments yet on this page. Please do add comments if you spot any problems, or have information to share

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics