Nannotax3 - ntax_mesozoic - Radiolithus undosus

Radiolithus undosus


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Radiolithus -> Radiolithus undosus
Sister taxa: R. laingii, R. hollandicus, R. orbiculatus, R. planus, R. undosus, R. sp.

Distinguishing features:
Parent taxon (Radiolithus): Near circular to stellate eprolithids with relatively narrow wall formed from 9-16 brick-like, wall-cycle elements surrounding a wide central area spanned by an amedian diaphragm. The wall is usually lower than those seen in Eprolithus.
This taxon: Radiolithus 9 wall-elements, low wall and outline star-like


Taxonomy:

Citation: Radiolithus undosus (Black, 1973) Varol, 1992
Rank: Species
Basionym: Rhombogyrus undosus Black, 1973
Taxonomic discussion: The holotype is a low walled eprolithid with nine petaloid wall-elements, and so is very similar to, or the same as, the Radiolithus planus species concept. Varol (1992) further considered that one cycle is stellate the other not.

Farinacci & Howe catalog pages: R. undosus *

Distinguishing features:
Parent taxon (Radiolithus): Near circular to stellate eprolithids with relatively narrow wall formed from 9-16 brick-like, wall-cycle elements surrounding a wide central area spanned by an amedian diaphragm. The wall is usually lower than those seen in Eprolithus.
This taxon: Radiolithus 9 wall-elements, low wall and outline star-like


Morphology:


Size:

Search data:
LITHS: nannolith-radiate, circular, star-shaped, cylindrical, CA: vacant, closed, CROSS-POLARS: T-prominent,
Lith size: 5->8┬Ám; Segments: 9->9;
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:
Last occurrence (top): within Late Cenomanian Substage (93.90-95.47Ma, top in Cenomanian stage). Data source: PRB nannotax entry
First occurrence (base): within Middle Albian Substage (107.59-110.22Ma, base in Albian stage). Data source: PRB nannotax entry

Plot of occurrence data:

References:

Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

Bralower, T. J. & Bergen, J. A. (1998). Cenomanian-Santonian calcareous nannofossil biostratigraphy of a transect of cores drilled across the Western Interior Seaway. In, Dean, W. E. & Arthur, M. A. (eds) Stratigraphy and paleoenvironments of the Cretaceous Western Interior Seaway. SEPM Concepts in Sedimentology and Paleontology. -. gs

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


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Radiolithus undosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-9-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10982 Go to Archive.is to create a permanent copy of this page - citation notes



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