Discoaster moorei


Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. exilis group -> Discoaster moorei
Sister taxa: D. exilis, D. cauliflorus, D. moorei, D. extensus, D. discissus ⟩⟨ D. bollii ⟩⟨ D. petaliformis, D. signus, D. apetalus

Taxonomy:

Citation: Discoaster moorei Bukry 1971
Rank: Species

Distinguishing features: Asymetric 5-rayed discoaster with bifurcations.

Farinacci & Howe catalog pages: D. moorei *


Morphology: Asymetric 5-rayed specimens occur occasonally with nearly all 6-rayed discoasters and it is likely that this is not a genuine species but rather a variant of D. deflandrei and D. exilis. It is, however, commonly identified.

Search data:
TagsLITHS: nannolith-radiate, asymmetric, star-shaped, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 8->18µm; Segments: 5->5;
Data source notes: size from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Specimens can occur throughout the Miocene, and even the Oligocene, but more characteristic of the mid Miocene
Last occurrence (top): within NN5 zone (13.53-14.91Ma, top in Serravallian stage). Data source: Perch-Nielsen 1985
First occurrence (base): within NN4 zone (14.91-17.95Ma, base in Burdigalian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

References:

Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs V O

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

Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

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


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Discoaster moorei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=484 Go to Archive.is to create a permanent copy of this page - citation notes



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Michael Styzen (Port Angeles WA, US)

None of those photos above look like what I would call Disaster moorei. the photos on the right and left are symmetrical, probably 5 rayed D. deflandrei, and the one in the center is overgrown to the point I' wouldn't use it. Look at the photo on page 475 of Perch Nielsen in Plankton Stratigraphy if you want a better idea of what it really should look like.

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