Discoaster styzenii


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

Taxonomy:

Citation: Discoaster styzenii Wei 2003
Rank: species
Synonyms:
Taxonomic discussion: 4-rayed variants of D. prepentaradiatus are rare but distinctive. They probably do not represent a separate species but distinguishing them can be stratigraphically useful - if working in expanded sections with common discoasters.

Distinguishing features: 4-rayed D. prepentaradiatus, often asymmetric

Farinacci & Howe catalog pages:

Search data:
TagsLITHS: nannolith-radiate, quadrate, star-shaped, CROSS-POLARS: 1ou, V-prominent,
MetricsLith 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 siginficantly higher within NN9 than the 5-rayed forms; its LAD is at a similar level, near the top of NN10 to the 5-rayed forms
Last occurrence (top): near top of NN10 zone (85% up, 8.5Ma, in Tortonian stage). Data source: Browning et al 2017
First occurrence (base): in upper part of NN9 zone (84% 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 V O

Wei, W. (2003). Upper Miocene nannofossil bistratigraphy and taxonomy of Exxon core CH30-43-2 from the Gulf of Mexico. Journal of Nannoplankton Research. 25(1): 17-23. gs V O


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Discoaster styzenii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1586 Go to Archive.is to create a permanent copy of this page - citation notes



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