Stephanolithion


Classification: Mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Stephanolithion
Sister taxa: Corollithion, Cylindralithus, Darwinilithus, Paralithella, Rectocorona, Rhombolithion, Rotelapillus, Stephanolithion, Stoverius, Stradnerlithus, Thurmannolithion, Truncatoscaphus,

Distinguishing features: Elliptical and often polygonal; rims low but broad, bicyclic; central-area spanned by one to eight bars; prominent spines protrude from the rim


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Narrowly elliptical, near-parallel sided, with transverse bar

Broadly elliptical or hexagonal, with long rim spines, and diagonal cross bars.

Elliptical, with very short rim spines, and diagonal cross bars.

Elliptical, with multiple rim spines and six cross bars.

Elliptical with multiple short rim spines and eight cross bars.

Specimens not identified to species level

Taxonomy:

Citation: Stephanolithion Deflandre, 1939
Rank: Genus
Type species: Stephanolithion bigotii Deflandre, 1939

Farinacci & Howe catalog pages: Stephanolithion *

Distinguishing features: Elliptical and often polygonal; rims low but broad, bicyclic; central-area spanned by one to eight bars; prominent spines protrude from the rim


Morphology remarks: Elliptical and often polygonal murolith (protolith) coccoliths with spines that protrude from the rim. The rims are low but relatively broad, have weakly-developed proximal/inner-cycles, and a central-area spanned by one to eight bars, supporting a central spine. LM image is usually bicyclic but the outer dark cycle of V-units is better developed than the inner cycle of R-units and the central structure non-birefringent,  so they are best viewed in phase contrast. The rim spines are formed by outwrd growth of single V-units from the rim.

Search data:
TagsLITHS: murolith, elliptical, CA: process, diagonal cross, V-UNITS: V-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 4->9µm;
Sources: 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): in mid part of Tithonian Stage (53% up, 148.3Ma, in Tithonian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Bajocian Stage (31% up, 169.7Ma, in Bajocian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

Deflandre, G. (1939). Les stéphanolithes, représentants d'un type nouveau de coccolithes Jurassique supérieur. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences. Paris. 208: 1331-1333. gs


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Stephanolithion compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-2-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11146 Go to Archive.is to create a permanent copy of this page - citation notes



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maryam (Iran)
Good luck always and a lot thanks for your good and excellent informations.
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