Calculites paulus


Classification: Mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites paulus
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: Very small (holotype 2.6 µm) Calculites with a long, narrow, central perforation


Taxonomy:

Citation: Calculites paulus Lees, 2007
Rank: Species

Farinacci & Howe catalog pages: Calculites paulus *

Distinguishing features: Very small (holotype 2.6 µm) Calculites with a long, narrow, central perforation


Morphology remarks: A very small species of Calculites that has an elongate, narrow central perforation. At 0 ̊ in XPL, two extinction lines are aligned with the polarising directions, but the short-axis line is offset. On rotation, the lines become v-shaped and occupy the ends of the lith. Differentiation: The very small size and elongate, narrow central perforation distinguish this species from other species of Calculites." [Lees 2007]

Size: Holotype dimensions: L = 2.64μm, W = 1.76μm

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 Early Maastrichtian Substage (69.91-72.05Ma, base in Maastrichtian 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

    Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 30(1): 39-56. gs


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    Calculites paulus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-11-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10174 Go to Archive.is to create a permanent copy of this page - citation notes



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