Micrantholithus speetonensis


Classification: Mesozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Micrantholithus -> Micrantholithus speetonensis
Sister taxa: M. brevis, M. hoschulzii, M. lambertii, M. obtusus, M. quasihoschulzii, M. speetonensis, M. spinulentus, M. stellatus, M. sp.,

Distinguishing features: Micrantholithus with crenulated outline due to two indentations in each segment.


Taxonomy:

Citation: Micrantholithus speetonensis Perch-Nielsen, 1979
Rank: Species

Farinacci & Howe catalog pages: Micrantholithus speetonensis *

Distinguishing features: Micrantholithus with crenulated outline due to two indentations in each segment.

Search data:
TagsLITHS: nannolith-radiate, pentagonal, star-shaped, CA: closed,
CSPH: equant, monomorphic, T-UNITS: T-prominent,
MetricsLith size: 8->12µm; Segments: 5->5;
Sources: illustrated specimens
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 BC4 zone (100% up, 135.7Ma, in Valanginian stage). Data source: Bown et al. 1998 - zonal marker
First occurrence (base): at base of BC4 zone (0% up, 138.3Ma, in Valanginian stage). Data source: Bown et al. 1998 - zonal marker

Plot of occurrence data:

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

    References:

    Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs :: ::

    Jakubowski, M. (1986). New calcareous nannofossil taxa from the Lower Cretaceous of the North Sea. INA Newsletter. 8: 38-42. gs :: view :: open

    Perch-Nielsen, K. (1979). Calcareous nannofossils from the Cretaceous between the North Sea and the Mediterranean. Aspekte der Kreide Europas, IUGS Series A. 6: 223-272. gs :: ::


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    Micrantholithus speetonensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-7-2020

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10663 Go to Archive.is to create a permanent copy of this page - citation notes



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