Stephanolithion bigotii subsp. maximum


Classification: Mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Stephanolithion -> Stephanolithion bigotii -> Stephanolithion bigotii subsp. maximum
Sister taxa: S. bigotii subsp. bigotii, S. bigotii subsp. maximum,

Distinguishing features: Large, elliptical Stephanolithion with multiple rim spines and wide central area spanned by diagonal cross bars


Taxonomy:

Citation: Stephanolithion bigotii subsp. maximum (Deflandre, 1939) Medd, 1979
Rank: Sub-species

Farinacci & Howe catalog pages: Stephanolithion bigoti maximum *

Distinguishing features: Large, elliptical Stephanolithion with multiple rim spines and wide central area spanned by diagonal cross bars


Size: Medd (1979) state that "overall measurements exceeding 6.0 x 3.0 µ", this is the size including the spines, it would be preferable to have a definition based on the coccolith rim length.

Geological Range:
Last occurrence (top): at top of NJ14 zone (100% up, 160.8Ma, in Oxfordian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event
First occurrence (base): at base of NJ14 zone (0% up, 163.6Ma, in Callovian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Stephanolithion bigotii

    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

    Bown, P. R., Cooper, M. K. E. & Lord, A. R. (1988). A calcareous nannofossil biozonation scheme for the early to mid Mesozoic. Newsletters on Stratigraphy. 20: 91-114. 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

    Grün, W. & Zweili, F. (1980). Das kalkige Nannoplankton der Dogger-Malm-Grenze im Berner Jura bei Liesberg (Schweiz). Jahrbuch der Geologischen Bundesanstalt. 123: 231-341. gs

    Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gs


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    Stephanolithion bigotii subsp. maximum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11150 Go to Archive.is to create a permanent copy of this page - citation notes



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