Discoaster altus

Classification: Coccolithophores -> Discoasterales -> Discoasteraceae -> Discoaster -> D. brouweri group -> Discoaster altus
Sister taxa: D. triradiatus, D. tamalis, D. asymmetricus, D. brouweri, D. altus, D. calcaris, D. braarudii, D. neorectus, D. dennei, D. formosus, D. pliostellulus, D. brouweri-like preservational morphotypes,


Citation: Discoaster altus Muller, 1974
Rank: Species
Synonyms: D. tristellifer Bukry, 1976. As explained by Young (1998) D. tristellifer and D. altus were described from the same material, DSDP Site 242 Core 3 Section 1, but without reference to each other. Both species were described as 6-rayed discoasters with very large proximal bosses and complanate rays. Re-examination of this material reveals, unsurprisingly, that it contains only one such species. The description of Bukry (1976), based on light microscopy, is more complete, since it mentions the smaller, but very distinct, distal knob. The description of Muller (1974), however, has priority so the correct name is D. altus. Bukry (1981) provide further illustrations and description.
Catinaster altus (Muller 1974) Perch-Nielsen 1984

Distinguishing features: 6 rayed with complanate rays; very large stellate proximal boss; and small distal boss.

Farinacci & Howe catalog pages: Discoaster altus * , Discoaster tristellifer *

Morphology remarks: Both bosses are well-developed as can be seen by focussing up through the specimens but the boss on one side is much larger than the other. The larger boss is considered proximal since the points of the star are directed along the rays rather than between them. Raytips on well-preserve specimens may have notch at the end.

Search data:
TagsLITHS: nannolith-radiate, star-shaped, RIM: tips-bifurcate, free-rays-long, free-rays-short, CA: process, PROCESS: boss, boss-prox & dist,
CSPH: not known, V-UNITS: all, V-prominent, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 10->20µm; Segments: 6->6;
Sources: size from illustrated specs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: A short-ranging and highly distinctive species, most records from the Indo-Pacific.
Last occurrence (top): within NN15 zone (3.70-3.92Ma, top in Zanclean stage). Data source: Young 1998
First occurrence (base): within NN14 zone (3.92-4.13Ma, base in Zanclean 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 altus, synonyms included - Catinaster altus; Discoaster altus; Discoaster tristellifer;
  • space-time plot :: Samples map :: Parent: D. brouweri group


    Bukry, D. (1976). Coccolith stratigraphy of Manihiki Plateau, Central Pacific, Deep Sea Drilling Project Site 317. Initial Reports of the Deep Sea Drilling Project. 33: 493-501. gs :: view :: open

    Bukry, D. (1981). Pacific coast coccolith stratigraphy between Point Conception and Cabo Orientes, Deep Sea Drilling Project Leg 63. Initial Reports of the Deep Sea Drilling Project. 63: 445-471. gs :: view :: open

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

    Perch-Nielsen, K. (1984). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs :: view :: open

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


    Discoaster altus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-7-2020

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=444 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)
    It would be nice to include the original description of D. tristellifer here if it is available from the Catalog. Maybe you could post it with a circle with a slash superimposed like a no smoking sign...
    Jeremy Young (NHM, UK)
    good point Mike, I will try to get this done (not just now though, as I am on a ship with slow internet connection). Actually though there is no need for a warning sign against Bukry's descrition of D. tristellifer, I would argue that it is a better descrition than that of D. altus; the name does not have does not priority but the description and illustration are still first rate.

    [NB The type illustrations can now be seen on this page, by clicking the Farinacci catalog page link - JRY March 2014] 
    Page 1 of 1

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