Rhagodiscaceae

Distinguishing features: 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
				Calcicalathina Muroliths (loxolith type) with high, narrow rim and wide central-area filled by a large, domed, granular mass.	C. alta C. clipeus C. erbae C. oblongata C. sp.
				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.	P. arata P. bullata P. dunkleyjonesii P. fenestrata P. hauxtonensis P. howardii P. imperfossa P. pearsonii P. pontilitha P. porosa P. nebulosa P. 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.	R. achlyostaurion R. amplus R. angustus R. asper R. cepekii R. dekaenelii R. infinitus R. pseudoangustus R. splendens R. adinfinitus R. gallagheri R. indistinctus R. pancostii R. plebeius R. robustus R. sageri R. eboracensis R. hamptonii R. reniformis R. sp.
				Zebrashapka Solid, truncated-cone-shaped nannolith (possibly a holococcolith), with distinct outer rim and banded core.	Z. vanhintei Z. sp.

Taxonomy:

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

Distinguishing features: 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 Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Tithonian Stage (0% up, 152.1Ma, in Tithonian stage). Data source: Total of range 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: 23-4-2021 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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