Calculites rosalyniae


Classification: ntax_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: C. rosalyniae *

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


Morphology: "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: ca_conjunct, pores, closed, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 4->5µm; Segments: 4->4;
Data source notes: 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:

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 V O

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: 20-1-2021

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