Nannotax3 - ntax_mesozoic - Lithastrinus Nannotax3 - ntax_mesozoic - Lithastrinus

Lithastrinus


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Lithastrinus
Sister taxa: Eprolithus, Radiolithus, Farhania, Lithastrinus, Uniplanarius, Quadrum, Micula, Palaeomicula

Distinguishing features:
Parent taxon (Polycyclolithaceae): Nannoliths composed of two superposed wall cycles and a central-area which may be closed, open and vacant, or spanned by a diaphragm-like structure. Elements have tangential c-axis orientation.
This taxon: Eprolithids with two cycles of five to seven ray-like, curved, wall-cycle elements surrounding a narrow median diaphragm.


Daughter taxa (time control age-window is: 0-800Ma)
Lithastrinus quadricuspis
Nannolith with two superposed cycles of four ray-like elements with a narrow central diaphragm. One cycle has long narrow rays and the other has much shorter rays.
Lithastrinus pentabrachius
Lithastrinus with five petaloid wall-elements
Lithastrinus grillii
Lithastrinus with six twisting petaloid wall-elements surrounding a narrow central area.
Lithastrinus septenarius
Lithastrinus with seven narrow, curving wall-elements surrounding a narrow central area.
Lithastrinus sp.
Specimens not identified to species level

Taxonomy:

Citation: Lithastrinus Stradner, 1962
taxonomic rank: Genus
Type species: Lithastrinus grillii Stradner, 1962.
Synonyms: Astrionis Wilcoxon 1972

Farinacci & Howe catalog pages: Lithastrinus + * , Astrionis *

Distinguishing features:
Parent taxon (Polycyclolithaceae): Nannoliths composed of two superposed wall cycles and a central-area which may be closed, open and vacant, or spanned by a diaphragm-like structure. Elements have tangential c-axis orientation.
This taxon: Eprolithids with two cycles of five to seven ray-like, curved, wall-cycle elements surrounding a narrow median diaphragm.

Search data:
LITHS: nannolith-radiate, pentagonal, quadrate, star-shaped, CA: closed,
Lith size: 5->15µm;
Data source notes: size range of included species
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 Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within UC9a subzone (89.95-90.14Ma, base in Turonian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

Stradner, H. (1962). Über neue und wenig bekannte Nannofossilien aus Kreide und Alttertiär. Verhandlungen der Geologischen Bundesanstalt (Wien). 2: 363-377. gs


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Lithastrinus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-2-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10569 Go to Archive.is to create a permanent copy of this page - citation notes
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