Crucibiscutum ryazanicum

Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Crucibiscutum -> Crucibiscutum ryazanicum
Sister taxa: C. hayi, C. neuquenensis, C. pinnatus, C. ryazanicum, C. salebrosum, C. trilensis, P. quadriperforatus, C. sp.,

Distinguishing features: Crucibiscutum with an asymmetrical central cross.


Citation: Crucibiscutum ryazanicum Jeremiah 2001
Rank: Species

Farinacci & Howe catalog pages: Crucibiscutum ryazanicum *

Distinguishing features: Crucibiscutum with an asymmetrical central cross.

Size: 4–5 µm long (mean 4.5 µm), 50 specimens measured. (Jeremiah 2001)

Search data:
TagsLITHS: placolith, elliptical, CA: process, diagonal cross, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 4->5µm;
Sources: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Jeremiah (2001) notes that similar asymmetric Crucibiscutum species also occur in the Upper Hauterivian, the Middle Albian and the lowermost Cenomanian of onshore UK but these occurrences are discontinuous
Last occurrence (top): within BC2 zone (138.76-139.22Ma, top in Valanginian stage). Data source: Jeremiah 2001
First occurrence (base): within BC2 zone (138.76-139.22Ma, base in Valanginian stage). Data source: Jeremiah 2001

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Crucibiscutum


    Jeremiah, J. (2001). A Lower Cretaceous nannofossil zonation for the North Sea Basin. Journal of Micropalaeontology. 20: 45-80. gs


    Crucibiscutum ryazanicum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-2-2020

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    Short stable page link: Go to to create a permanent copy of this page - citation notes

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