Calculites rosalyniae


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

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

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    Calculites rosalyniae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2019

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