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

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:
    TagsLITHS: holococcolith, elliptical, CA: process, CROSS-POLARS: V-prominent, R-prominent,
    MetricsLith 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:

    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


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    Zygrhablithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-3-2021

    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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