Nannotax3 - Coccolithophores

D. exilis group

Classification: Coccolithophores -> Discoasterales -> Discoasteraceae -> Discoaster -> D. exilis 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: (blue => in age window 0-800Ma)		Granddaughter taxa
	D. exilis and variants
	Discoaster exilis Small central-area; usually with weak distal and proximal bosses; bifurcations acutely angled in plan-view
	Discoaster cauliflorus large stellate stem and wide bifurcations
	Discoaster moorei Asymetric 5-rayed discoaster with bifurcations.
	Discoaster extensus Ray bifurcations curve proximally
	Discoaster discissus Wide, tapering rays with notched tips.
	D. bollii
	Discoaster bollii Similar to D. exilis but with large distal boss, small proximal boss, and wide central-area, and usually smaller (<10µm).	D. pentabollii D. quadribollii D. tribollii
	D. petaliformis & similar
	Discoaster petaliformis Similar to D. exilis but with very large mushroom-shaped distal boss and distinct proximal boss. Central-area narrow.
	Discoaster signus Similar to D. petaliformis but with longer bifurcations, and weaker boss.
	Discoaster apetalus Like D. petaliformis but without the central boss

Taxonomy:

Citation: Discoaster exilis group de Kaenel et al. 2017

Rank: species group

Farinacci & Howe catalog pages: Discoaster exilis group [no catalog entry yet]

Search data:

Tags
Metrics	Lith size: 0->0µm; Sources:

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in mid part of Tortonian Stage (48% up, 9.5Ma, in Tortonian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Burdigalian Stage (56% up, 17.9Ma, in Burdigalian 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

D. exilis group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2019

Taxon Search:

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1547 Go to Archive.is to create a permanent copy of this page - citation notes

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