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Nannotax3 - ntax_main - Daktylethra Nannotax3 - ntax_main - Daktylethra

Daktylethra

Classification: ntax_main -> Holococcoliths -> fossil holococcoliths -> Daktylethra
Sister taxa: Daktylethra, Holodiscolithus, Lanternithus, Multipartis, Octolithus, Quadrilateris, Semihololithus, Varolia, Youngilithus, Zygrhablithus ⟩⟨ Aubrysphaera, Corannulus, Orthozygus, Peritrachelina, 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

Taxonomic rank: genus

Type species: Daktylethra punctulata Gartner in Gartner & Bukry, 1969

Taxonomic discussion: Usually seen in side view.

Distinguishing features:
Parent taxon (fossil holococcoliths): Holococcolith genera only known from the fossil record
This taxon: Domed cavate holococcoliths with surficial shallow pits.

Farinacci & Howe catalog pages:
Daktylethra *

Search data:

LITHS: holococcolith, elliptical, CA: pores, closed, CROSS-POLARS: 1ou, V-prominent,

Lith 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): at top of NP17 zone (100% up, 37.3Ma, in Priabonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
See also: customisable plot Parent: fossil holococcoliths

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

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

Daktylethra compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-6-2026

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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