Calculites anfractus


Classification: Mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites anfractus
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 four blocks divided along diagonal sutures that bend sharply where they meet the rim. The transverse and longitundinal blocks are in opposing crystallographic orientation.


Taxonomy:

Citation: Calculites anfractus (Jakubowski, 1986) Varol & Jakubowski, 1989
Rank: Species
Basionym: Phanulithus anfractus Jakubowski, 1986

Farinacci & Howe catalog pages: Phanulithus anfractus * , ,

Distinguishing features: Calculites with four blocks divided along diagonal sutures that bend sharply where they meet the rim. The transverse and longitundinal blocks are in opposing crystallographic orientation.

Geological Range:
Last occurrence (top): near top of UC3b subzone (90% up, 95.1Ma, in Cenomanian stage). Data source: Burnett 1998, fig. 6.2
First occurrence (base): within UC0 (-Ma, base in stage). Data source: Burnett 1998

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:

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

    Jakubowski, M. (1986). New calcareous nannofossil taxa from the Lower Cretaceous of the North Sea. INA Newsletter. 8: 38-42. gs

    Varol, O. & Jakubowski, M. (1989). Some new nannofossil taxa. INA Newsletter. 11: 24-29. gs


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    Calculites anfractus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10165 Go to Archive.is to create a permanent copy of this page - citation notes



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