Nannotax3 - ntax_mesozoic - Quadrum intermedium Nannotax3 - ntax_mesozoic - Quadrum intermedium

Quadrum intermedium


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Quadrum -> Quadrum intermedium
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: Stellate to cubiform Quadrum with four large wall-cycle elements alternating with one to three smaller wall-cycle elements.


Taxonomy:

Citation: Quadrum intermedium Varol, 1992
Rank: Species

Farinacci & Howe catalog pages: Q. intermedium *

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: Stellate to cubiform Quadrum with four large wall-cycle elements alternating with one to three smaller wall-cycle elements.

Search data:
LITHS: nannolith-radiate, star-shaped, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 4->6µm; Segments: 5->7;
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): in lower part of UC10 zone (40% up, 88.5Ma, in Coniacian stage). Data source: Burnett 1998, fig. 6.4
First occurrence (base): at base of UC5c subzone (0% up, 94.1Ma, in Cenomanian stage). Data source: Burnett 1998 (subzonal marker), fig.6.2

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

Hardas, P. & Mutterlose, J. (2006). Calcareous nannofossil biostratigraphy of the Cenomanian/Turonian boundary interval of ODP Leg 207 at the Demerara Rise. Revue de Micropaléontologie. 49(3): 165-179. gs

Linnert, C., Mutterlose, J. & Erbacher, J. (2010). Calcareous nannofossils of the Cenomanian/Turonian boundary interval from the Boreal Realm (Wunstorf, northwest Germany). Marine Micropaleontology. 74: 38-58. gs

Püttmann, T. & Mutterlose, J. (2019). Calcareous nannofossils from a Late Cretaceous nearshore setting. Journal of Nannoplankton Research. S4: 81-88. gs V O

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 intermedium compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-3-2023

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