Biscutum davyi


Classification: 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. depravatus, 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: Biscutum 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.

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:

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

    References:

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

    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: 20-1-2020

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