Nannotax3 - ntax_mesozoic - Biscutum dissimilis

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.

PospWiseLeg113-Maas-Pl1-Fig6a.JPG
Wise & Wind 1977-DSDP36-pl23-1.JPG
Burnett1998-6-05-26.jpg
PospWiseLeg113-Maas-Pl1-Fig6b-c.JPG
Burnett1998-6-05-27.jpg
KPC Biscutum dissimilis.JPG
WindWise1983 Leg71 pl1-04.JPG
Wise & Wind 1977-DSDP36-pl23-2.JPG
Wise & Wind 1977-DSDP36-pl23-3.JPG
Wise & Wind 1977-DSDP36-pl23-4.JPG
Wise & Wind 1977-DSDP36-pl23-5.JPG
Wise & Wind 1977-DSDP36-pl24-5.JPG
Wise & Wind 1977-DSDP36-pl24-6.JPG
Wise & Wind 1977-DSDP36-pl24-7.JPG
Wise & Wind 1977-DSDP36-pl24-9.JPG

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:

Tags	LITHS: placolith, asymmetric, elliptical, CA: ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith 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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Biscutum dissimilis, synonyms included - Biscutum dissimilis;
See also 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 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