Radiolithus laingii

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

Distinguishing features: Radiolithus with 10-16 wall-elements and high wall.


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: Radiolithus laingii * , Eprolithus bettenstaedtii *

Distinguishing features: Radiolithus with 10-16 wall-elements and high wall.

Morphology remarks: 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)

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: vacant, closed, T-UNITS: T-prominent,
MetricsLith size: 5->8µm; Segments: 10->16;
Sources: 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:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Radiolithus laingii, synonyms included - Eprolithus bettenstaeditti; Eprolithus bettenstaedtii; Radiolithus laingii;
  • space-time plot :: Samples map :: Parent: Radiolithus


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

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


    Radiolithus laingii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-8-2020

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    Short stable page link: Go to to create a permanent copy of this page - citation notes

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