Discoaster berggrenii

Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. quinqueramus group -> Discoaster berggrenii
Sister taxa: D. quintatus, D. quinqueramus ⟩⟨ D. berggrenii, D. explicatus, D. consutus ⟩⟨ D. bergenii, D. compactus, D. vinsonii, D. abrachiatus ⟩⟨ D. newellii, D. tetracladus, D. hexaramus, D. prolixus


Citation: Discoaster berggrenii Bukry, 1971
Rank: Species
Variants: Discoaster berggrenii ssp. extensus Wei 2003 variant in which the sutural ridges protrude beyond the edges of the central disk.
Taxonomic discussion: As observed by Muller (1974) and Theodoridis (1984) D. berggrenii grades into D. quinqueramus, and is probably not a separate species. It is, however, only common in the lower part of the range of D. quinqueramus; and discrimination of it is easy.

Distinguishing features: Intermediate between D. bergennii and D. quinqueramus; central-area 1-2x free ray length [or, adjacent rays separated at central area].

Farinacci & Howe catalog pages: D. berggrenii + + *

Search data:
TagsLITHS: nannolith-radiate, pentagonal, star-shaped, CA: process, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 8->15µm; Segments: 5->5;
Data source notes: size from OD & illustrated specs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: D. bergenii, D. bergrennii and D. quinqueramus apparently form an anagenetic lineage, with central area size deceasing and free ray length increasing. Distinguishing them is useful for determining position within the early part of zone NN11.
Last occurrence (top): near top of NN11 zone (90% up, 5.9Ma, in Messinian stage). Data source: Young 1998 (fig. 8.4)
First occurrence (base): at base of NN11 zone (0% up, 8.3Ma, in Tortonian stage). Data source: zonal marker, with D. quinqueramus (see e.g. Young 1998)

Plot of occurrence data:


Bergen, J. A. (1984). Calcareous nannoplankton from Deep Sea Drilling Project Leg 78A: evidence for imbricate underthrusting at the Lesser Antillian active margin. Initial Reports of the Deep Sea Drilling Project. 78A: 411-445. gs V O

Blair, S. A., Bergen, J. A., de Kaenel, E., Browning, E. & Boesiger, T. M. (2017). Upper Miocene-Lower Pliocene taxonomy and stratigraphy in the circum North Atlantic Basin: radiation and extinction of Amauroliths, Ceratoliths and the D. quinqueramus lineage. Journal of Nannoplankton Research. 37(2-3): 113-144. gs V O

Bukry, D. (1971a). Discoaster evolutionary trends. Micropaleontology. 17: 43-52. gs

Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs V O

Perch-Nielsen, K. (1972b). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs V O

Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs V O

Wei, W. (2003). Upper Miocene nannofossil bistratigraphy and taxonomy of Exxon core CH30-43-2 from the Gulf of Mexico. Journal of Nannoplankton Research. 25(1): 17-23. gs V O

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O


Discoaster berggrenii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=452 Go to Archive.is to create a permanent copy of this page - citation notes

Comments (2)

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Mike Styzen (Noble Energy, US)
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.
Magdy (ALS - Ellington Associates, Jamaica)
Thanks for producing sketches for the Discoaster quinqueramus/berggrenii plexus. I found it very useful.
Some how I lost the original copy. Could you tell where you have posted this document, hopefully I will be able to download it.
Jeremy Young (UCL, UK)
Hi Magdy
A copy of the diagram is here. GECP chart - and it is linked to from the D. quinqueramus group page. I have slightly cleaned up Mike's original diagram and added the coloured columns on the right but otherwise it is his figure."""
Mike Styzen (Noble Energy, US)
Discoaster berggrenii extensus: A few years ago Wuchang Wei erected a new subspecies, Discoaster berggrenii extensus for forms in which the star in the central area extends beyond the central area. This taxon is used pretty universally in the GOM as a Late Miocene under the name of \Discoaster C". I think, however that the name D. berggrenii extensus should be supressed. I have started to see reports from various sources that list this taxon simply as \""Discoaster extensus\"" which, of course, is something else alltogether. In my opinion, since this form is used as an index fossil by such a lirge number of workers, that we should consider making it a seperate species."""
Jeremy Young (NHM, UK)
do you have the reference for the original description? It would be good to add it to the system.
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