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Quadrum eneabrachium


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Quadrum -> Quadrum eneabrachium
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 9 elements per cycle


Taxonomy:

Citation: Quadrum eneabrachium Varol, 1992
Taxonomic rank: species

Farinacci & Howe catalog pages: Q. eneabrachium *

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 9 elements per cycle

Search data:
LITHS: nannolith-radiate, star-shaped, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 3->5µm; Segments: 9->9;
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): within Santonian Stage (83.65-85.70Ma, top in Santonian stage). Data source: Burnett 1998
First occurrence (base): within Middle Albian Substage (107.59-109.70Ma, base in Albian stage). Data source: Burnett 1998

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 O

Kanungo, S., Bown, P. R. & Gale, A. S. (2020). Cretaceous (Albian-Turonian) calcareous nannofossil biostratigraphy of the onshore Cauvery Basin, southeastern India. Cretaceous Research. 118 [2021]: 1-22. gs

Varol, O. (1992). Taxonomic revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy. Newsletters on Stratigraphy. 27(93-127): -. gs

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Quadrum eneabrachium compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10968 Go to Archive.is to create a permanent copy of this page - citation notes
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