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Discoaster quinqueramus
Edited by Jeremy Young on Fri, 14/10/2011 - 22:17
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:
Size: Highly variable, c.5-15microns.
Synonym: D. quintatus Bukry & Bramlette 1969
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Neogene: Discoaster; Discoaster quinqueramus
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Discoaster quinqueramus/berggrenii plexus
I posted a document with some sketches from the original Gulf Coast Taxonomic Equivalency Project of this group in the forum.
page on D. quinqueramus/bergrennii plexus
Mike's forum post has managed to get misplaced, which is infortnute as it is an mportant set of a species and a good illustratin of how the site could be used. So, I have reformated the content as a standalone page, linked to the relevant taxon pages.