Rhagodiscaceae


Ancestry: Mesozoic -> Eiffellithales -> Rhagodiscaceae
Sister taxa: Chiastozygaceae, Eiffellithaceae, Rhagodiscaceae,

Short diagnosis: Murolith (loxolith type) coccoliths with dominant distal/outer cycles and central-areas typically filled by a plate of granular calcite. The central structure may be spine-bearing, perforate or massive. LM images are typically unicyclic.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Muroliths (loxolith type) with high, narrow rim and wide central-area filled by a large, domed, granular mass.

Loxolith coccoliths with narrow outer cycle and wide central area filled with a granular plate or bridge.

Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and spine-bearing. Rim image is typically unicyclic in XPL.

Solid, truncated-cone-shaped nannolith (probably a holococcolith), with distinct outer rim and banded core.

Taxonomy:

Citation: Rhagodiscaceae Hay, 1977
Rank: Family
Type species: Rhagodiscus Reinhardt, 1967.

Farinacci & Howe catalog pages:

Short diagnosis: Murolith (loxolith type) coccoliths with dominant distal/outer cycles and central-areas typically filled by a plate of granular calcite. The central structure may be spine-bearing, perforate or massive. LM images are typically unicyclic.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

Hay, W.W., (1977). Calcareous nannofossils. In: Ramsay, A.T.S. (Editor), Oceanic Micropalaentology. Academic Press, London, pp. 1055-1200.


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Rhagodiscaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-8-2017

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AphiaID: 955540 Nomenclatural data on WoRMS
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