Calculites maghredaswampensis

Classification: Mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites maghredaswampensis
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: Medium sized (holotype 5.3 µm) with a small central perforation and kinked isogyres.


Citation: Calculites maghredaswampensis Lees, 2007
Rank: Species

Farinacci & Howe catalog pages: Calculites maghredaswampensis * , ,

Distinguishing features: Medium sized (holotype 5.3 µm) with a small central perforation and kinked isogyres.

Morphology remarks: "A medium-sized species of Calculites with a small central perforation. In XPL at 0 ̊, the extinction lines are are aligned with the polarising directions, but kink as they move into the central area, where they meet in the middle. On rotation, these form a sigmoidal x-shape across the lith. Differentiation: Distinguished from other Calculites by its kinked extinction lines and central perforation." [Lees 2007]

Size: Holotype dimensions: L = 5.28μm, W = 3.52μm.

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian 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


    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


    Calculites maghredaswampensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-7-2019

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