Nannotax3 - ntax_mesozoic - Radiolithus laingii

Radiolithus laingii


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Radiolithus -> Radiolithus laingii
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 with 10-16 wall-elements and high wall.


Taxonomy:

Citation: Radiolithus laingii Varol, 1992
Rank: Species
Synonyms: Eprolithus bettenstaedtii Mutterlose 1992 [my interpretation, NB I have not checked publication dates so it may have priority - JRY 2015]

Farinacci & Howe catalog pages: R. laingii * , E. bettenstaedtii *

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 with 10-16 wall-elements and high wall.


Morphology:

Remarks: The specimens with ten to twelve elements in each cycle of the wall are most common. R. laingii differs from R . hollandicus in having a high wall(> 4 µm) and wider wall elements in plan view which are strongly birefringent under cross-polarised light. (Varol 1992)

Size:

Search data:
LITHS: nannolith-radiate, circular, cylindrical, CA: vacant, closed, CROSS-POLARS: T-prominent,
Lith size: 5->8µm; Segments: 10->16;
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 Late Albian Substage (100.50-107.59Ma, top in Albian stage). Data source: Varol, 1992 (original description)
First occurrence (base): within Late Aptian Substage (112.95-122.98Ma, base in Aptian stage). Data source: Varol, 1992 (original description)

Plot of occurrence data:

References:

Mutterlose, J. (1992b). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results. 123: 343-368. gs V O

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 laingii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-9-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10978 Go to Archive.is to create a permanent copy of this page - citation notes



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