Biscutum dissimilis


Classification: Mesozoic -> Podorhabdales -> Biscutaceae -> Biscutum -> Biscutum dissimilis
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: Large (8-11 µm), irregular formed/asymmetric, central area very small, closed, proximal shield reduced.


Taxonomy:

Citation: Biscutum dissimilis Wind & Wise in Wise & Wind, 1977
Rank: Species

Farinacci & Howe catalog pages: Biscutum dissimilis *

Distinguishing features: Large (8-11 µm), irregular formed/asymmetric, central area very small, closed, proximal shield reduced.

Search data:
TagsLITHS: placolith, asymmetric, elliptical, CA: closed, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 8->11µm;
Sources: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: LAD earlier in austral province, UC15d (Burnett 1998). All the ilustrated examples in Wise & Wind (1977) are from the Maastrichtian or Campanian but they record as it as common in Late Albian (sites 327A & 330).
Last occurrence (top): in upper part of UC17 zone (80% up, 71.2Ma, in Maastrichtian stage). Data source: Burnett 1998, fig 6.6
First occurrence (base): within Late Albian Substage (100.50-107.59Ma, base in Albian stage). Data source: Wise & Wind 1977

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Biscutum dissimilis, synonyms included - Biscutum dissimilis;
  • space-time plot :: Samples map :: Parent: Biscutum

    References:

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs :: ::

    Pospichal, J. J. & Wise, S. W. (1990). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs :: view :: open

    Wind, F. H. & Wise, S. W. (1983). Correlation of upper Campanian-lower Maestrichtian calcareous nannofossil assemblages in drill and piston cores from the Falkland Plateau, southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 551-563. gs :: view :: open

    Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs :: view :: open

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    Biscutum dissimilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10076 Go to Archive.is to create a permanent copy of this page - citation notes
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