Nannotax3 - ntax_cenozoic - D. deflandrei group

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.

Daughter taxa (time control age-window is: 0-800Ma)
				D. deflandrei and variants
				Discoaster deflandrei 6-rayed discoaster with a well developed central area; rays ending in strong short wide bifurcations.
				Discoaster calculosus broad central area, large (>15 µm) with "broad & shallow inter-ray areas
				Discoaster salomonii broad central area
				Discoaster emblematicus broad central-area, ornate & broadly rounded bifurcation
				Discoaster durioi ornate central-area & angular bifurcation
				Discoaster saundersi ornate central-area & angular bifurcation
				Discoaster nephados short flaring rays & very broad bifurcation
				Discoaster leroyi 5-rayed variant of D. deflandrei
				D. kugleri and variants
				Discoaster kugleri Central-area wide and flat. Free rays short, with notched ends rather than true bifurcations; often thicker than the central area.
				Discoaster hexapleuros Like D. kugleri but with parallel-sided rays and hexagonal central area periphery.
				Discoaster cuspidatus Like D. kugleri but with longer, tapering rays.
				D. druggii and variants
				Discoaster druggii Like D. deflandrei but larger, >15µm, and without distinct bifurcations
				Discoaster shumnykii

Taxonomy:

Citation: Discoaster deflandrei group

Rank: species group

Taxonomic 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

D. deflandrei group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-7-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1543 Go to Archive.is to create a permanent copy of this page - citation notes

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