Percivalia nebulosa


Classification: Mesozoic -> Eiffellithales -> Rhagodiscaceae -> Percivalia -> Percivalia nebulosa
Sister taxa: P. arata, P. bullata, P. dunkleyjonesii, P. fenestrata, P. hauxtonensis, P. howardii, P. imperfossa, P. pearsonii, P. pontilitha, P. porosa, P. nebulosa, P. sp.,

Distinguishing features: Percivalia with a granular central plate in the form of an axial cross.


Taxonomy:

Citation: Percivalia nebulosa (Bralower in Bralower et al., 1989) Aguado et al. 2000
Rank: Species
Basionym: Rhagodiscus nebulosa Bralower in Bralower et al., 1989

Farinacci & Howe catalog pages: Rhagodiscus nebulosus *

Distinguishing features: Percivalia with a granular central plate in the form of an axial cross.


Morphology remarks: According to Aguado et al. (2000, p.20-21) this species intergrades with P. fenestrata but has a wider, more prominent low birefringence axial structure. 

Search data:
TagsLITHS: murolith, elliptical, CA: cross-axial, plate, R-UNITS: R-prominent, DETAILS: rim-unicyclic,
MetricsLith size: 5->10µm;
Sources: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Valanginian Stage (133.88-139.39Ma, top in Valanginian stage). Data source: Bralower et al., 1989
First occurrence (base): within Berriasian Stage (139.39-145.01Ma, base in Berriasian stage). Data source: Bralower et al., 1989

Plot of occurrence data:

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

    References:

    Aguado, R., Company, M. & Tavera, J. M. (2000). The Berriasian/Valanginian boundary in the Mediterranean region: new data from the Caravaca and Cehegín sections, SE Spain. Cretaceous Research. 21: 1-21. gs :: ::

    Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs :: ::


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    Percivalia nebulosa compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11025 Go to Archive.is to create a permanent copy of this page - citation notes



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