Nannotax3 - ntax_mesozoic - Quadrum bengalensis

Quadrum bengalensis


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Quadrum -> Quadrum bengalensis
Sister taxa: Q. gartneri, Q. svabenickae, Q. bengalensis ⟩⟨ Q. intermedium, Q. eptabrachium, Q. octobrachium, Q. eneabrachium, Q. giganteum, Q. sp.

Distinguishing features:
Parent taxon (Quadrum): Stellate to cubiform nannoliths with walls formed from two cycles of 4-9 elements and no central opening or diaphragm. When cubiform, the elements are joined along sutures that go out to the mid-point of the 'cube' edges.
This taxon: Quadrum with one cycle larger than the other.


Taxonomy:

Citation: Quadrum bengalensis Burnett, 1997
Rank: Species

Farinacci & Howe catalog pages: Q. bengalensis *

Distinguishing features:
Parent taxon (Quadrum): Stellate to cubiform nannoliths with walls formed from two cycles of 4-9 elements and no central opening or diaphragm. When cubiform, the elements are joined along sutures that go out to the mid-point of the 'cube' edges.
This taxon: Quadrum with one cycle larger than the other.


Morphology:

A form of Quadrum which has one cycle larger then the other. The larger cycle appears to be slightly flared, and the elements slightly separated from one another. Differs from other Quadrum species with four elements per face in being distinctly wider at one end. [Burnett 1997]

Size:


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: nannolith-radiate, asymmetric, quadrate, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 4->5µm; Segments: 4->4;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within Late Maastrichtian Substage (66.04-69.91Ma, base in Maastrichtian stage). Data source: Burnett 1998

Plot of occurrence data:

References:

Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs V O

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


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Quadrum bengalensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10967 Go to Archive.is to create a permanent copy of this page - citation notes



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