Biscutum dissimilis


Classification: ntax_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. depravatum, 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: B. 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: ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 8->11µm;
Data source notes: 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:

References:

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

Pospichal, J. J. & Wise, S. W. (1990b). 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 V O

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 V O

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 V O


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Biscutum dissimilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2021

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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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