Stephanolithion


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

Short diagnosis: 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 0-300Ma) Granddaughter taxa
Narrowly elliptical, near-parallel sided Stephanolithion with tranverse bar spanning the narrow central area.

Broadly elliptical or hexagonal Stephanolithion with long rim spines and central area spanned by diagonal cross bars.

Elliptical Stephanolithion with very short rim spines and central area spanned by diagonal cross bars.

Sub-circular Stephanolithion with central cross and short rim spines

Elliptical Stephanolithion with multiple rim spines and central area spanned by six cross bars.

Elliptical Stephanolithion with multiple short rim spines and central area spanned by 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 *

Short diagnosis: 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. LM image is usually bicyclic but they are best viewed in PC.

Geological Range:
Last occurrence (top): within Tithonian Stage (145.01-152.06Ma, top in Tithonian stage). Data source: Total of range of species in this database
First occurrence (base): within Bajocian Stage (168.28-170.30Ma, base 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. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.

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.


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Stephanolithion compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-10-2017

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