Variant: Discoaster bolivariae is regarded here as a variant of Discoaster hamatus.
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 hamatus): 5-rayed; ray tips with clockwise deflected (in distal view) proximal extensions.
This taxon: 4-rayed D. hamatus
Farinacci & Howe catalog pages: D. bolivariae *
Search data:
LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent, |
Lith size: 0->0µm; |
Geological Range:
Notes: Browning et al. (2017), record this form as having too rare and sproradic occurrence to be able to precisely constrain its age.
Last occurrence (top): within NN9 zone (9.53-10.55Ma, top in Tortonian stage). Data source: Browning et al 2017
First occurrence (base): within NN9 zone (9.53-10.55Ma, base 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 bolivariae 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=1645 Go to Archive.is to create a permanent copy of this page - citation notes |
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