Eiffellithales


Classification: Mesozoic -> Eiffellithales
Sister taxa: Arkhangelskiales, Eiffellithales, Stephanolithiales, Podorhabdales, Watznaueriales, Syracosphaerales, Heterococcoliths inc sedis, Holococcoliths, Braarudosphaerales, Nannoliths inc sedis, Mesozoic non–coccoliths, hidden,

Distinguishing features: Murolith coccoliths with V-units forming a narrow imbricate outer wall and R-units extending to form a wide inner rim cycle or plate. Most with a spine bearing central cross.


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Murolith coccoliths with rim formed of outer cycle of imbricate V-units and variably developed inner cycle of R-units. Disjunct central bar or cross, usually supporting a spine.

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

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.

Taxonomy:

Citation: Eiffellithales Rood et al., 1971
Rank: Order

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

Distinguishing features: Murolith coccoliths with V-units forming a narrow imbricate outer wall and R-units extending to form a wide inner rim cycle or plate. Most with a spine bearing central cross.

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 base of Ypresian Stage (1% up, 55.9Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Norian Stage (50% up, 218.9Ma, in Norian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. (1998). Triassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 29-33. gs :: ::

Rood, A. P., Hay, W. W. & Barnard, T. (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae. 64: 245-272. gs :: view :: open


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Eiffellithales compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-7-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10405 Go to Archive.is to create a permanent copy of this page - citation notes



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