Biscutum davyi


Classification: ntax_mesozoic -> Podorhabdales -> Biscutaceae -> Biscutum -> Biscutum davyi
Sister taxa: B. constans, B. ellipticum ⟩⟨ B. coronum, B. dekaenelii, B. magnum, B. melaniae ⟩⟨ B. arrogans, B. asymmetricum, B. boletum, B. dissimilis, B. zulloii ⟩⟨ B. hattneri, B. notaculum, B. virginica ⟩⟨ B. gaultensis, B. thurowii ⟩⟨ B. davyi, B. depravatum, B. dorsetensis, B. dubium, B. erismatum, B. grande, B. intermedium, B. planum, B. profundum, B. sp.

Distinguishing features: Biscutum with a narrow central area spanned by axial cross bars; the longitudinal bar is particularly broad and tapers towards the the ends of the central area. Bicyclic LM image in XPL.


Taxonomy:

Citation: Biscutum davyi Bown in Bown & Cooper, 1989
Rank: Species

Farinacci & Howe catalog pages: B. davyi *

Distinguishing features: Biscutum with a narrow central area spanned by axial cross bars; the longitudinal bar is particularly broad and tapers towards the the ends of the central area. Bicyclic LM image in XPL.

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 5->6µm;
Data source notes: 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 NJ6 zone (180.49-181.63Ma, top in Toarcian stage). Data source: Bown & Cooper 1998
First occurrence (base): within NJ6 zone (180.49-181.63Ma, base in Toarcian stage). Data source: Bown & Cooper 1998

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1989b). New calcareous nannofssils from the Jurassic. Journal of Micropalaeontology. 8: 91-96. gs V O

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs


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Biscutum davyi compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10073 Go to Archive.is to create a permanent copy of this page - citation notes



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