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Discoaster quinqueramus

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Cenozoic Taxa

Discoaster quinqueramus

Edited by Jeremy Young on Fri, 14/10/2011 - 23:17

Discoaster quinqueramus Gartner 1969

Description: Symmetrical 5-rayed discoaster; central-area, with prominent distal sutural ridges and large proximal boss; rays concavo-convex, with rounded tips. Central area width less than free ray length.

Remarks: D. bergenii, D. bergrennii and D. quinqueramus form an anagenetic lineage, with central area size decreasing and free ray length increasing. Distinguishing them is useful for determining position within the early part of zone NN11. See also separate page on this plexus.

Original description:

Discoaster quinqueramus 080124.jpgDiscoaster quinqueramus 080125.jpg

8-13quinqueramus.JPG 8-14quinqueramus.JPG 8-15quinqueramus.JPGDquinq263-14NN11.JPG

Size: Highly variable, c.5-15microns.

Synonym: D. quintatus Bukry & Bramlette 1969

Geological Time Data
Geological Time Periods: 
NN11
NN11
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
Notes on occurrence information: 
Confined to NN11 (zone defining species). Virtually absent from the Mediterranean and Para-Tethys.
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