Variant: Discoaster discissus is regarded here as a variant of Discoaster exilis.
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 exilis): Small central-area; usually with weak distal and proximal bosses; bifurcations acutely angled in plan-view
This taxon: Wide, tapering rays with notched tips.
Farinacci & Howe catalog pages: D. discissus *
Search data:
| LITHS: nannolith-radiate, star-shaped, CA: process, CROSS-POLARS: 1ou, V-prominent, |
| Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): within NN8 zone (10.55-10.89Ma, top in Tortonian stage). Data source: de Kaenel et al 2017
First occurrence (base): within NN5 zone (13.53-14.91Ma, base in Langhian stage). Data source: de Kaenel et al 2017
Plot of occurrence data:
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Discoaster discissus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-11-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1573 Go to Archive.is to create a permanent copy of this page - citation notes |
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