Calculites cyclops

Classification: Mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites cyclops
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: Calculites with a single, relatively wide, central perforiation 


Citation: Calculites cyclops Lees, 2007
Rank: Species

Farinacci & Howe catalog pages: Calculites cyclops * , ,

Distinguishing features: Calculites with a single, relatively wide, central perforiation 

Morphology remarks: A small species of Calculites that has a relatively wide central perforation. At 0 ̊ in XPL, the extinction lines are aligned with the polarising directions. On rotation, the lines become v-shaped and occupy the ends of the lith. Differentiation: The wide central perforation distinguishes it from other species of Calculites.

Size: Holotype dimensions: L = 4.84μm, W = 3.52μm.

Geological Range:
Last occurrence (top): within Turonian Stage (89.77-93.90Ma, top in Turonian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian 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 cyclops compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2019

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