D. deflandrei group
Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. deflandrei group
Sister taxa: D. brouweri group, D. pentaradiatus group, D. quinqueramus group, D. variabilis group, D. exilis group, D. musicus group, D. deflandrei group ⟩⟨ D. nodifer group, D. lodoensis group, D. multiradiatus group, D. araneus group, D. sp.
Taxonomy:
Citation: Discoaster deflandrei groupRank: species groupTaxonomic discussion: This is the dominant discoaster group from the Oligocene to the Middle Miocene. They are variable in shape of the terminations, central area width and whether a boss is present in the centre, but these features are intergradational and frequently obscured by diagenesis. Many workers identify the vast majority of specimens as D. deflandrei. Additional important and widely used species are D. druggii and D. kugleri.
Distinguishing features: Complanate 6-rayed discoasters with robust bifurcations and smple central-areas
Farinacci & Howe catalog pages: Discoaster deflandrei group [no catalog entry yet]
Search data:
| Tags | LITHS: |
| Metrics | Lith size: 0->0µm; |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Last occurrence (top): in lower part of Tortonian Stage (17% up, 10.9Ma, in Tortonian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Ypresian Stage (67% up, 50.5Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Discoaster
References:
de Kaenel, E., Bergen, J. A., Browning, E., Blair, S. A. & Boesiger, T. M. (2017). Uppermost Oligocene to Middle Miocene Discoaster and Catinaster taxonomy and stratigraphy in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 215-244. gs V O
