Discoaster septemradiatus


Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. nodifer group -> Discoaster septemradiatus
Sister taxa: D. cruciformis, D. colletii, D. gemmifer, D. mediosus, D. binodosus, D. nodifer, D. distinctus, D. septemradiatus, D. tanii, D. tani ornatus, D. istanbulensis, D. martinii, D. williamsii, D. backmanii, D. okadai

Taxonomy:

Citation: Discoaster septemradiatus (Klumpp 1953) Martini 1958
Rank: Species
Basionym: Agalmatoaster septemradiatus Klumpp 1953
Synonyms:
Variants:

Distinguishing features: >6 rayed stellate discoasters; ray tips with bifurcations (similar to D. deflandrei apart from number of rays)

Farinacci & Howe catalog pages: A. septemradiatus * , D. nonaradiatus * , D. heptaradiatus * , D. floreus *

See also: Discoaster deflandrei - similar but with 6 rays;

Search data:
TagsLITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 6->12µm; Segments: 5->8;
Data source notes: size from illustrated specs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Middle Eocene Sub-Epoch (37.75-47.84Ma, top in Bartonian stage). Data source: Bown & Dunkley Jones, 2012
First occurrence (base): within NP12 zone (50.50-53.70Ma, base in Ypresian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

References:

Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 30(1): 57-79. gs V O

Martini, E. (1958). Discoasteriden und verwandte Formen im NW-deutschen Eozän (Coccolithophorida). 1. Taxonomische Untersuchungen. Senckenbergiana Lethaea. 39: 353-388. gs

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

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 V O

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

Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. 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


nannotaxlogo400px

Discoaster septemradiatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=500 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (1)

Sort By
Page 1 of 1
 
Gravatar
Ines Galovic (Zagreb, Croatia)

Shouldn't it be a part of D. deflandrei group, if it differs from D. deflandrei in the number of rays?

Gravatar
Jeremy Young (Tonbridge, UK)

Hi Ines

The nodifer group here is for Palaeogene species and the deflandrei group for Early Neogene ones, so septemradiatus needs to be in the nodifer group. The Pleogene/Miocene divide makes sense because during the Oligocene typically D. deflandrei is the only species present. - but there are some vey similar morphologies in the two groups and indeed deflandrei itself ranges from the Eocene. Jeremy

Page 1 of 1
 

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics