Nannotax3 - ntax_mesozoic - Triscutum beaminsterensis

Triscutum beaminsterensis


Classification: ntax_mesozoic -> Podorhabdales -> Mazaganellaceae -> Triscutum -> Triscutum beaminsterensis
Sister taxa: T. beaminsterensis, T. expansus, T. pricatillus, T. sullivanii, T. tiziense, T. sp.

Distinguishing features:
Parent taxon (Triscutum): Three-shielded placoliths with a wide central-area spanned by a proximal net or grill.
This taxon: Large (8-9 µm) Triscutum with broad high distal shield and central area spanned by a perforate net.


Taxonomy:

Citation: Triscutum beaminsterensis Dockerill, 1987
Rank: Species

Farinacci & Howe catalog pages: T. beaminsterensis *

Distinguishing features:
Parent taxon (Triscutum): Three-shielded placoliths with a wide central-area spanned by a proximal net or grill.
This taxon: Large (8-9 µm) Triscutum with broad high distal shield and central area spanned by a perforate net.

Search data:
TagsLITHS: placolith, elliptical, cylindrical, hollow, CA: ca_disjunct, grill, CROSS-POLARS: R-prominent,
MetricsLith size: 8->9µm;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Middle Oxfordian Substage (159.70-160.84Ma, top in Oxfordian stage). Data source: Bown & Cooper 1998
First occurrence (base): within Early Bathonian Substage (167.37-168.28Ma, base in Bathonian stage). Data source: Bown & Cooper 1998

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

Dockerill, H. J. (1987). Triscutum, a distinctive new coccolith from the Jurassic. Bulletin des Centres de Recherches Exploration-Production Elf-Aquitaine. 11: 127-131. gs


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Triscutum beaminsterensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 9-12-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11253 Go to Archive.is to create a permanent copy of this page - citation notes



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