Rhagodiscaceae

Distinguishing features:
Parent taxon (Eiffellithales): Murolith coccoliths with an upper/outer cycle of clockwise-imbricate V-units and a lower/inner cycle of R-units. 


This taxon: Eiffelithales with V-units forming most of rim (R-units typically thin plates on proximal surface, so LM images are typically unicyclic. Central-areas typically filled by a plate of granular calcite. The central structure may be spine-bearing, perforate or massive.

Daughter taxa (time control age-window is: 0-800Ma)					Granddaughter taxa
				Percivalia Loxolith coccoliths with narrow outer cycle and wide central area filled with a granular plate or bridge, multiple concentric cycles seen on proximal face.	Percivalia arata Percivalia bullata Percivalia dunkleyjonesii Percivalia fenestrata Percivalia hauxtonensis Percivalia howardii Percivalia imperfossa Percivalia pearsonii Percivalia pontilitha Percivalia porosa Percivalia nebulosa Percivalia sp.
				Rhagodiscus Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.	Rhagodiscus achlyostaurion Rhagodiscus amplus Rhagodiscus angustus Rhagodiscus asper Rhagodiscus cepekii Rhagodiscus dekaenelii Rhagodiscus infinitus Rhagodiscus pseudoangustus Rhagodiscus splendens Rhagodiscus adinfinitus Rhagodiscus gallagheri Rhagodiscus indistinctus Rhagodiscus pancostii Rhagodiscus plebeius Rhagodiscus robustus Rhagodiscus sageri Rhagodiscus sicutclipeus Rhagodiscus eboracensis Rhagodiscus hamptonii Rhagodiscus reniformis Rhagodiscus sp.
				Central area filled by mass of small elements
				Calcicalathina Muroliths (loxolith type) with high, narrow rim and wide central-area filled by a large, domed, granular mass.	Calcicalathina alta Calcicalathina clipeus Calcicalathina erbae Calcicalathina oblongata Calcicalathina sp.
				Zebrashapka Solid, truncated-cone-shaped coccolith (possibly a holococcolith), with distinct outer rim and banded core.	Zebrashapka vanhintei Zebrashapka sp.

Taxonomy:

Farinacci & Howe catalog pages: Rhagodiscaceae [no catalog entry yet]

Distinguishing features:
Parent taxon (Eiffellithales): Murolith coccoliths with an upper/outer cycle of clockwise-imbricate V-units and a lower/inner cycle of R-units. 


This taxon: Eiffelithales with V-units forming most of rim (R-units typically thin plates on proximal surface, so LM images are typically unicyclic. Central-areas typically filled by a plate of granular calcite. The central structure may be spine-bearing, perforate or massive.

Geological Range:
Last occurrence (top): at top of Late Maastrichtian Substage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian 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. For the customisable plot option go to a genus page Parent: Eiffellithales

Rhagodiscaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-12-2023 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11011 Go to Archive.is to create a permanent copy of this page - citation notes

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