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

nannotaxlogo400px

Discoaster backmanii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-4-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=448 Go to Archive.is to create a permanent copy of this page - citation notes
Powered by Mikrotax taxonomy content management system developed by Jeremy Young


Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics