Biscutum intermedium


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

Distinguishing features: A broadly elliptical Biscutum with a narrow central area spanned by a broad, hollow-spine-bearing, oblique transverse bar. Weakly bicyclic image in XPL.


Taxonomy:

Citation: Biscutum intermedium Bown, 1987
Rank: Species

Farinacci & Howe catalog pages: Biscutum intermedium *

Distinguishing features: A broadly elliptical Biscutum with a narrow central area spanned by a broad, hollow-spine-bearing, oblique transverse bar. Weakly bicyclic image in XPL.

Geological Range:
Last occurrence (top): within NJ12a subzone (165.55-166.40Ma, top in Callovian stage). Data source: Bown & Cooper 1998
First occurrence (base): within NJ8a subzone (171.79-174.59Ma, 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. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

    Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 118-. gs

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    Biscutum intermedium compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-8-2019

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