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Holodiscolithus


Classification: ntax_main -> Holococcoliths -> fossil holococcoliths -> Holodiscolithus
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)Granddaughter taxa
Holodiscolithus agniniae
Flat, elliptical, formed from six crystallographic blocks divided by near-radial sutures.

Holodiscolithus catellus
Elliptical, narrow rim copmosed of many small elements, vacant central area

Holodiscolithus geisenii
Small, elliptical with complex, weakly birefringent, central plate

Holodiscolithus lippertii
elliptical, with axial ridges & 8-10 perforations; formed of 4 blocks with diagonal sutures

Holodiscolithus liui
Small, elliptical with open central area spanned by broad transverse bar (dark at 0°)

Holodiscolithus macroporus
Elliptical, non-birefringent in plan view, with 10-16 pores
Holodiscolithus macroporus early forms

Holodiscolithus minolettii
Elliptical, narrow dark rim composed of many small elements, central plate of birefringent blocks.

Holodiscolithus serus
Small, elliptical holococcolith with a narrow rim and small, bright transverse bar spanning the central area.

Holodiscolithus solidus
Cavate elliptical holococcolith; bars define 6 holes - 2 at ends and 4 at sides
Holodiscolithus solidus later specimens
Holodiscolithus solidus earlier specimens

Holodiscolithus whitesideae
Small, cavate, only known from side-view, steep-sided base with short, narrow spine and median septum

Holodiscolithus sp.
Specimens which cannot be assigned to any established species


Taxonomy:
Citation: Holodiscolithus Roth 1970
Taxonomic rank: genus
Type species: Holodiscolithus macroporus (Deflandre in Deflandre & Fert, 1954) Roth, 1970 [Discolithus]
Taxonomic discussion: The coccoliths included in this genus are all disc-like but otherwise seem highly variable in structure and crystallography

Synonyms:

Distinguishing features:
Parent taxon (fossil holococcoliths): Holococcolith genera only known from the fossil record
This taxon: Elliptical holococcoliths with perforations.

Search data:
LITHS: holococcolith, elliptical, hollow,
Lith size: 2.5->6µm;
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 NN20 zone (100% up, 0.3Ma, in Ionian 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:

Roth, P. H. (1970). Oligocene calcareous nannoplankton biostratigraphy. Eclogae Geologicae Helvetiae. 63: 799-881. gs O


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Holodiscolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-9-2026

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=715 Go to Archive.is to create a permanent copy of this page - citation notes



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