Eiffellithaceae


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

Distinguishing features: V-units form narrow outer rim; R-units form broad inner rim or plate. Almost all with a central spine-bearing cross.


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Loxolith coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light; this cycle is broader than the outer rim cycle. The central area is spanned by variably-orientated cross-bars.

Loxolith coccoliths with bicyclic rim with broad inner cycle and narrow central-area, filled by broad cross bars. The rim image is distinctly bicyclic and the inner cycle and cross bars are birefringent. 

Murolith (loxolith) coccoliths with a prominent inner rim cycle that is birefringent and conspicuous in cross-polarised light. This cycle is broader than the outer rim cycle. The central area is spanned by curving, diagonal cross-bars.

Taxonomy:

Citation: Eiffellithaceae Reinhardt, 1965
Rank: Family
Type species: Eiffellithus Reinhardt, 1965

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

Distinguishing features: V-units form narrow outer rim; R-units form broad inner rim or plate. Almost all with a central spine-bearing cross.


Morphology remarks: Murolith (loxolith type) coccoliths with well-developed proximal/inner cycles and typically wide central-areas spanned by axial, non-axial (± asymmetric) or diagonal cross-bars. The broad, proximal/inner cycle is conspicuous in the LM, creating a strongly bicyclic image.

Search data:
TagsLITHS: murolith,
MetricsLith size: 0->0µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

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): in lower part of Berriasian Stage (26% up, 143.5Ma, in Berriasian 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. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Reinhardt, P. (1965). Neue Familien für fossile Kalkflagellaten (Coccolithophoriden, Coccolithineen). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 7: 30-40. gs


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Eiffellithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-2-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10404 Go to Archive.is to create a permanent copy of this page - citation notes



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