Discoaster surculus

Classification: Coccolithophores -> Discoasterales -> Discoasteraceae -> Discoaster -> D. variabilis group -> Discoaster surculus
Sister taxa: D. surculus, D. toralus, D. pseudovariabilis, D. subsurculus, D. variabilis, D. icarus, D. pansus, D. pansulus, D. decorus, D. loeblichii, D. mendomobensis,


Citation: Discoaster surculus Martini and Bramlette, 1963
Rank: Species
Notes & discussion: In LM through focusing is often needed to see the ray tip extensions. D. surculus, like D. variabilis, varies considerably in size, and in ray tip morphology. It has not, however, been subdivided.

Distinguishing features: 6-rayed with trifurcate ray-tips, central branch directed proximally

Farinacci & Howe catalog pages: Discoaster surculus *

Morphology remarks: 6-rayed discoaster with trifurcate ray-tips. Similar to D. variabilis but with proximal ray tip extensions giving trifurcate appearance to ray tips. Usually slightly concavo-convex with well-developed central area and showing strong differentiation of proximal and distal surface.

Search data:
TagsLITHS: nannolith-radiate, star-shaped, RIM: free-rays-long, tips-trifurcate, CA: process, PROCESS: boss, boss-prox & dist,
CSPH: not known, V-UNITS: all, V-prominent, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 10->22µm; Segments: 6->6;
Sources: 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: Common from NN11A to top NN16. Its last occurrence is used as a datum, the first occurrence is not since it is rather gradational.
Last occurrence (top): at top of NN16 zone (100% up, 2.5Ma, in Gelasian stage). Data source: zonal marker (see e.g. Young 1998)
First occurrence (base): within NN11a subzone (7.42-8.29Ma, base in Tortonian stage). Data source: Young 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Discoaster surculus, synonyms included - Discoaster mirabilis; Discoaster surculus; Discoaster surculus (3-rays); Discoaster surculus (grainy);
  • space-time plot :: Samples map :: Parent: D. variabilis group


    Browning, E., Bergen, J. A., Blair, S. A., Boesiger, T. M. & de Kaenel, E. (2017). Late Miocene to Late Pliocene taxonomy and stratigraphy of the genus Discoaster in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 189-214. gs :: view :: open

    de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs :: view :: open

    Martini, E. & Bramlette, M. N. (1963). Calcareous nannoplankton from the experimental Mohole drilling. Journal of Paleontology. 37: 845-855. gs :: ::

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

    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 :: view :: open

    Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs :: view :: open

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

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


    Discoaster surculus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-6-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=507 Go to Archive.is to create a permanent copy of this page - citation notes

    Comments (1)

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    Mike Styzen (Noble Energy, US)
    Discoaster \9"(Shell US): On the GOM charts I published I have a marker slightly older than the LAD of D. brouweri that I base on the LAD of a species designated as Discoaster 9 (P 1.8). I have always regarded this taxon to be the last gasp of D. surculus, and thus the last gasp of the D. variabilis group. It is a robust six rayed form, usually between 5 and 10 microns with paralell sided rays which have either squared off (overgrown?) or slightly notched tips. If the central area has a knob I call it Discoaster 9a. As I recall both have the same top. The equivalent GOM benthic foram marker is Christellaria S (LAD Lenticulina cf. wallacei) Other workers Have another equivalent Discoaster marker Discoaster \""brouweri A\"". This is not the same bug as Discoaster 9. I'll leave it to someone who actually uses that species to describe it."""
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