Holodiscolithus


Classification: ntax_cenozoic -> Holococcoliths -> fossil holococcoliths -> Holodiscolithus
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)
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 minolettii
Elliptical, narrow dark rim copmosed 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 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
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

Distinguishing features: Elliptical holococcoliths with perforations.

Farinacci & Howe catalog pages: Holodiscolithus *

Search data:
TagsLITHS: holococcolith, elliptical, hollow,
MetricsLith 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): in upper part of Ionian Stage (75% up, 0.3Ma, in Ionian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Danian Stage (63% up, 63.2Ma, in Danian stage). Data source: Total of range 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 V O


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

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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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