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