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. | Eiffellithus eximius Eiffellithus lindiensis Eiffellithus gorkae Eiffellithus keio Eiffellithus parallelus Eiffellithus pospichalii Eiffellithus turriseiffelii Eiffellithus collis Eiffellithus equibiramus Eiffellithus parvus Eiffellithus monechiae Eiffellithus praestigium Eiffellithus vonsalisiae Eiffellithus hancockii Eiffellithus paragogus Eiffellithus primus Eiffellithus striatus Eiffellithus windii Eiffellithus sp. | ||||
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. | Helicolithus anceps Helicolithus trabeculatus Helicolithus leckiei Helicolithus tectufissus Helicolithus turonicus Helicolithus varolii Helicolithus compactus Helicolithus blairiae Helicolithus 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. |
Taxonomy:
Farinacci & Howe catalog pages: Eiffellithaceae
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, |
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Middle Berriasian Substage (139.90-141.40Ma, base in Berriasian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O Reinhardt, P. (1965). Neue Familien für fossile Kalkflagellaten (Coccolithophoriden, Coccolithineen). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 7: 30-40. gs References:
Eiffellithaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-10-2024
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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