Eiffellithales


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

Short diagnosis: Murolith coccoliths with a distal/outer cycle of clockwise-imbricating elements.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Murolith (loxolith type) coccoliths with variably-developed proximal/inner cycles and central-areas typically spanned by axial, non-axial or diagonal cross-bars or a single transverse bar, which is commonly formed from four fused arms/bars. LM images may be unicyclic or bicyclic.

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.

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:

Short diagnosis: Murolith coccoliths with a distal/outer cycle of clockwise-imbricating elements.

Geological Range:
Last occurrence (top): within Selandian Stage (59.24-61.61Ma, top in Selandian stage). Data source: Total of range of species in this database
First occurrence (base): within Norian Stage (209.46-228.35Ma, base 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. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 29-33.

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


Nannotax3 - Mesozoic - Eiffellithales by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-6-2017

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