Radiolithus

Distinguishing features:
Parent taxon (Polycyclolithaceae): Nannoliths composed of two superposed wall cycles and a central-area which may be closed, open and vacant, or spanned by a diaphragm-like structure. Elements have tangential c-axis orientation.
This taxon: 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.

Daughter taxa (time control age-window is: 0-800Ma)
				Radiolithus laingii Radiolithus with 10-16 wall-elements and high wall.
				Radiolithus hollandicus Radiolithus 10-16 wall-elements and low wall
				Radiolithus orbiculatus Radiolithus with 9 wall-elements and high wall.
				Radiolithus planus Radiolithus with 9 wall-elements and low wall
				Radiolithus undosus Radiolithus 9 wall-elements, low wall and outline star-like
				Radiolithus sp. Specimens not identified to species level

Taxonomy:

Farinacci & Howe catalog pages: Radiolithus + * , Rhombogyrus *

Distinguishing features:
Parent taxon (Polycyclolithaceae): Nannoliths composed of two superposed wall cycles and a central-area which may be closed, open and vacant, or spanned by a diaphragm-like structure. Elements have tangential c-axis orientation.
This taxon: 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.

Morphology:

Geological Range:
Last occurrence (top): at top of Turonian Stage (100% up, 89.4Ma, in Turonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Aptian Stage (113.20-121.40Ma, base in Aptian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Polycyclolithaceae

Radiolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10976 Go to Archive.is to create a permanent copy of this page - citation notes

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