Nannotax3 - ntax_cenozoic - Diantholitha Nannotax3 - ntax_cenozoic - Diantholitha

Diantholitha


Classification: ntax_cenozoic -> Discoasterales -> Fasciculithaceae -> Diantholitha
Sister taxa: Diantholitha, Fasciculithus, Gomphiolithus, Lithoptychius, Tectulithus

Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Diantholitha mariposa

Diantholitha alata
Diantholitha magnolia
Diantholitha pilula
Diantholitha toquea

Diantholitha sp.


Taxonomy:

Citation: Diantholitha Aubry in Aubry et al. 2011
taxonomic rank: Genus
Type species: Diantholitha mariposa Rodriguez & Aubry, in Aubry et al. 2011
Taxonomic discussion: This is a readily identified nannolith and quite distinct from the other genera included in the Fasciculithaceae. The five described species are less well differentiated and have no documented stratigraphic utility. If only one species is recognised the correct name is D. mariposa, since it is the type species of the genus.

Distinguishing features:
Parent taxon (Fasciculithaceae): Conical or cylindrical discoasteralids consisting of 10-30 wedge-shaped, radially-arranged elements, in one to three superposed cycles.
This taxon: Squat fasciculiths divided into sub-equal upper and lower cycles with different optical orientations. Conical openings on both sides, no fenestrae

Farinacci & Howe catalog pages: Diantholitha + *


Morphology:

In plan view the extinction cross is much less regular than in the true fasciculiths. Also if the larger cycle is assumed to be proximal then the column shows different crystalographic reintation to that of fasciculiths.

Search data:
LITHS: nannolith-radiate, circular, cylindrical, hollow, CROSS-POLARS: V-prominent, R-prominent,
Lith size: 5->9µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Confined to a short interval within NP4  - this is best documented in Monechi et al. 2013, who indicate the range is approximately equivalent to magnetochron C27n
Last occurrence (top): at top of NP4 zone (100% up, 61.5Ma, in Selandian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP4 zone (61.51-63.25Ma, base in Danian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Aubry, M. P., Bord, D. & Rodriguez, O. (2011). New taxa of the Order Discoasterales Hay 1977. Micropaleontology. 57(3): 269-287. gs

Aubry, M. -P., Rodriguez, O., Bord, D., Godfrey, L., Schmitz, B. & Knox, R. W. O. B. (2012). The first radation of the Fasciculiths: Morphologic adaptations of the coccolithophores to oligotrophy. Australian Journal of Earth Sciences. 105(1): 29-38. gs

Miniati, F., Cappelli, C. & Monechi, S. (2021). Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition. Journal of Micropalaeontology. 40: 101-144. gs O

Monechi, S., Reale, V., Bernaola, G. & Balestra, B. (2013). The Danian/Selandian boundary at Site 1262 (South Atlantic) and in the Tethyan region: Biomagnetostratigraphy, evolutionary trends in fasciculiths and environmental effects of the Latest Danian Event. Marine Micropaleontology. 98(1): 28-40. gs


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Diantholitha compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-5-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=433 Go to Archive.is to create a permanent copy of this page - citation notes
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