Daktylethra


Classification: ntax_cenozoic -> Holococcoliths -> fossil holococcoliths -> Daktylethra
Sister taxa: Clathrolithus, Corannulus, Daktylethra, Holodiscolithus, Lanternithus, Multipartis, Octolithus, Orthozygus, Quadrilateris, Semihololithus, Varolia, Youngilithus, Zygrhablithus, Unidentified fossil holococcoliths

Daughter taxa (time control age-window is: 0-800Ma)
Daktylethra punctulata
Tall, thick-walled, cavate, dome-shaped coccoliths, seen in side-view, with a distinctly undulating outer surface. The crystallites form crystallographically-continuous blocks that are bright in XPL when the long axis is parallel with the polarising direction.
Daktylethra probertii
Cavate holococcolith, seen in side-view, comprising a thin proximal plate and rim that are crystallographically distinct from a large, perforate, domed distal process. Typically, birefringent at 0° in XPL, darkening when rotated to 45°.
Daktylethra unitatis
Cavate holococcolith, seen in side-view, with a thin basal plate, walls and domed distal cover made up of crystallites that are crystallographically-continuous and dark at 0° in XPL, brightening when rotated to 45°. The surface is covered with shallow perforations/pits.
Daktylethra basilica
Cavate with thin basal plate and thick flaring walls extending to one-third the height of the specimen; domed distal cover showing perforations. The basal plate, walls and dome are crystallographically continuous and bright at 45° in XPL, darkening slightly when rotated to 0°. The central cavate opening is almost circular in side view.
Daktylethra sp.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Daktylethra Gartner in Gartner & Bukry, 1969
Rank: Genus
Type species: Daktylethra punctulata Gartner in Gartner & Bukry, 1969
Taxonomic discussion: Usually seen in side view.

Distinguishing features: Domed cavate holococcoliths with surficial shallow pits.

Farinacci & Howe catalog pages: Daktylethra *

Search data:
TagsLITHS: holococcolith, elliptical, CA: pores, closed, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 3->8µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): near base of Priabonian Stage (11% up, 37.3Ma, in Priabonian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Lutetian Stage (0% up, 47.8Ma, in Lutetian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs V O

Gartner, S. & Bukry, D. (1969). Tertiary holococcoliths. Journal of Paleontology. 43(5): 1213-1221. gs


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Daktylethra compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-4-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=426 Go to Archive.is to create a permanent copy of this page - citation notes



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