Discoaster backmanii


Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. nodifer group -> Discoaster backmanii
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 backmanii Agnini et al., 2008
Rank: Species
Synonyms: Discoaster sp. 1 Okada & Thierstein 1979 - also recorded as Discoaster sp. 1 by Monechi 1985 and Agnini et al. 2007 
Taxonomic discussion: Simlar morphotypes are listed under "Discoaster brouweri–like preservational morphotypes" - and including several taxa from the Palaeogene, but this is the earliest such form

Distinguishing features: 5-7 (typically 6) rayed, simple, stellate discoasters with broad, tapering rays joined along 1/2 their length.

Farinacci & Howe catalog pages: D. backmanii *

See also: Discoaster brouweri–like preservational morphotypes ;

Search data:
TagsLITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 7->15µm; Segments: 5->7;
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:
Last occurrence (top): in lower part of NP9 zone (20% up, 56.9Ma, in Ypresian stage). Data source: Agnini et al., 2007, fig. 9
First occurrence (base): in mid part of NP8 zone (50% up, 58Ma, in Thanetian stage). Data source: Agnini et al., 2006, fig. 9

Plot of occurrence data:

References:

Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007a). High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: Implications for calcareous nannoplankton evolution. Marine Micropaleontology. 64: 215-248. gs

Agnini, C., Fornaciari, E. & Raffi, I. (2008). Three new species of calcareous nannofossil from Late Palaeocene and Early Eocene assemblages (Ocean Drilling Program Site 1262, Walvis Ridge, SE Atlantic Ocean). Journal of Nannoplankton Research. 30(1): 51-56. gs V O

Monechi, S. (1985). Campanian to Pleistocene calcareous nannofossil stratigraphy from the Northwest Pacific Ocean, Deep Sea Drilling Project Leg 86. Initial Reports of the Deep Sea Drilling Project. 86: 301-336. gs V O

Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V O

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

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