Distinguishing features: Formed of 4 blocks like C. obscurus, but with a perforation in each block, and blocks go into extinction separately
Taxonomy:
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.
Tags | LITHS: holococcolith, elliptical, CA: ca_conjunct, pores, closed, CROSS-POLARS: rim-unicyclic, R-prominent, |
Metrics | Lith size: 4->5µm; Segments: 4->4; Data source notes: holotype +/-0.5µm |
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:
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. gsReferences:
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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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