Nannotax3 - ntax_cenozoic - Discoaster okadai

Discoaster okadai

Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. nodifer group -> Discoaster okadai
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 okadai Bukry, 1981

Rank: Species

Distinguishing features: 4- to 7-rayed very large (20-45µm) discoaster, with long, thin, tapering free rays (broadest at their mid-point) and small central area.

Farinacci & Howe catalog pages: D. okadai *

Search data:

Tags	LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent,
Metrics	Lith size: 20->45µm; Segments: 30->50; 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): at top of NP8 zone (95% up, 57.3Ma, in Thanetian stage). Data source: Agnini et al. 2007, fig. 9
First occurrence (base): in upper part of NP8 zone (80% up, 57.5Ma, in Thanetian stage). Data source: Agnini et al. 2007, fig. 9

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Discoaster okadai, synonyms included - Discoaster okadai;
See also space-time plot :: Samples map :: Parent: D. nodifer group

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

Bukry, D. (1981b). 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 V O

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

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=490 Go to Archive.is to create a permanent copy of this page - citation notes

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