Nannotax3 - ntax_mesozoic - Eiffellithaceae

Eiffellithaceae


Classification: ntax_mesozoic -> Eiffellithales -> Eiffellithaceae
Sister taxa: Chiastozygaceae, Eiffellithaceae, 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 in which V-units form a narrow outer rim; R-units form broad inner rim or plate. Almost all with a disjunct central spine-bearing cross.


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Eiffellithus
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.

Helicolithus
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. 
H. anceps
H. trabeculatus
H. leckiei
H. tectufissus
H. turonicus
H. varolii
H. compactus
H. blairiae
H. sp.

Tegumentum
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.
T. lucidum
T. octiformis
T. stradneri
T. sp.

Taxonomy:

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

Farinacci & Howe catalog pages: Eiffellithaceae [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 in which V-units form a narrow outer rim; R-units form broad inner rim or plate. Almost all with a disjunct central spine-bearing cross.


Morphology: 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;
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 Danian 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 V O


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Eiffellithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2021

Taxon Search:
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Short stable page link: https://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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