Nannotax3 - ntax_cenozoic - Discoaster trifolius Nannotax3 - ntax_cenozoic - Discoaster trifolius

Discoaster trifolius

Variant: Discoaster trifolius is regarded here as a variant of Discoaster prepentaradiatus.
I.e. It is a subjective junior synonym, but some workers many find it useful for some studies (e.g. experienced biostratigraphers working with abundant, well preserved material), but for most purposes differentiating it is not reccomended. Please do use the comments section at the bottom of this page if you wish to discuss this interpretation


Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. pentaradiatus group -> Discoaster prepentaradiatus -> Discoaster trifolius
Sister taxa: D. prepentaradiatus prepentaradiatus, D. prepentaradiatus plautus, D. styzenii, D. trifolius

Taxonomy:

Citation: Discoaster trifolius Browning & Bergen, in Browning et al. 2017
taxonomic rank: species
Synonyms:

Distinguishing features:
Parent taxon (Discoaster prepentaradiatus): Symmetric with bifurcations; rays planar and all show similar birefringence.
This taxon: 3-rayed D. prepentaradiatus

Farinacci & Howe catalog pages: D. trifolius *

Search data:
LITHS: nannolith-radiate, star-shaped, triangular, CROSS-POLARS: 1ou, V-prominent,
Lith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: According to Browning et al. (2017) this form has its FAD significantly higher within NN9 than the 5-rayed forms; likewise its LAD is lower within NN10 than the 5-rayed forms.
Last occurrence (top): in mid part of NN10 zone (50% up, 8.9Ma, in Tortonian stage). Data source: Browning et al 2017
First occurrence (base): in upper part of NN9 zone (80% up, 9.7Ma, in Tortonian stage). Data source: Browning et al 2017

Plot of occurrence data:

References:

Browning, E., Bergen, J. A., Blair, S. A., Boesiger, T. M. & de Kaenel, E. (2017). Late Miocene to Late Pliocene taxonomy and stratigraphy of the genus Discoaster in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 189-214. gs


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Discoaster trifolius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-9-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1587 Go to Archive.is to create a permanent copy of this page - citation notes
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