Nannotax3 - ntax_cenozoic

Zygrhablithus

Classification: ntax_cenozoic -> Holococcoliths -> fossil holococcoliths -> Zygrhablithus
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)		Granddaughter taxa
	Zygrhablithus bijugatus Large rod-shaped holococcolith with small basal disk	Z. bijugatus subsp. bijugatus Z. bijugatus subsp. cornutus Z. bijugatus subsp. maximus Z. bijugatus subsp. nolfi
	Zygrhablithus sileensis Cavate holococcolith with a base and hollow distal process with 4 arches. The process and most of the base are formed of four blocks, in addition a narrow rim surrounds the base.
	Zygrhablithus sp. Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Zygrhablithus Deflandre, 1959

Rank: Genus

Type species: Zygrhablithus bijugatus (Deflandre in Deflandre & Fert, 1954) [Zygolithus]

Synonyms: Pseudozygrhablithus Haq 1971 (all species synonimised with Z. bijugatus)

Sujkowskiella Hay et al. 1966 (type sp. is syn. of Z .bijugatus)

Distinguishing features: Spinose holococcoliths, which are birefringent in side view. In plan view the coccoliths are non-birefringent with a distinct figure-of-eight shaped central structure.

Farinacci & Howe catalog pages: Zygrhablithus + * , Pseudozygrhablithus * , Sujkowskiella *

Search data:

Tags	LITHS: holococcolith, elliptical, CA: process, CROSS-POLARS: V-prominent, R-prominent,
Metrics	Lith size: 5->16µm; Segments: 4->4;

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 Aquitanian Stage (8% up, 22.8Ma, in Aquitanian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Thanetian Stage (62% up, 57.2Ma, in Thanetian stage). Data source: Total of range 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
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: fossil holococcoliths

References:

Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs

Haq, B. U. (1971). Paleogene calcareous nannoflora. Parts I-IV. Stockholm Contributions in Geology. 25: 1-158. gs

Zygrhablithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-4-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1529 Go to Archive.is to create a permanent copy of this page - citation notes

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