Calculites juliae


Classification: Mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites juliae
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: Small (holotype 3.3 µm), with wide central plate with multiple perforations.


Taxonomy:

Citation: Calculites juliae Lees, 2007
Rank: Species

Farinacci & Howe catalog pages: Calculites juliae *

Distinguishing features: Small (holotype 3.3 µm), with wide central plate with multiple perforations.


Morphology remarks: "A small species of Calculites, comprising a narrow rim enclosing a multiperforate plate (six perforations, two larger ones situated at each end of the lith and four smaller ones arranged around the outsides of the middle of the plate). The plate goes dark upon rotation. Differentiation: The new species is smaller than most Calculites species and has symmetrically-distributed perforations around the central plate, which distinguishes it from other species." [Lees 2007]

Size: Holotype dimensions: L = 3.30μm, 2.20μm.

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


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

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