Nannotax3 - ntax_cenozoic - Discoaster anartios

Discoaster anartios


Classification: ntax_cenozoic -> Discoasterales -> Discoasteraceae -> Discoaster -> D. araneus group -> Discoaster anartios
Sister taxa: D. anartios, D. salisburgensis var. villosus, D. araneus, D. acutus

Taxonomy:

Citation: Discoaster anartios Bybell & Self-Trail, 1995
Rank: Species
Basionym: Discoaster anartios Bybell & Self-Trail, 1995
Synonyms:

Taxonomic discussion:
PETM excursion taxon. Bralower & Self-Trail (2016) argue that this is better regarded as a sub-species of D. salisburgensis.

Distinguishing features:
Parent taxon (D. araneus group): Irregular "malformed" discoasters characteristic of the PETM excursion
This taxon: 15-20 rays. Large to very large, typically asymmetric, rosette-shaped discoaster with a tall narrow stem on one side and 15-20 irregularly shaped curving rays that are free rays for around half the diameter.

Farinacci & Howe catalog pages: D. anartios *

See also: Discoaster salisburgensis - the non-malformed species this form is derived from, according to Bralower & Self-Trail (2016);

Search data:
TagsLITHS: nannolith-radiate, asymmetric, star-shaped, CA: process, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 12->25µm; Segments: 15->20;
Data source notes: size from OD and specs illustrated in Bralower & Self-Trail 2016
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP10 zone (54.17-55.86Ma, top in Ypresian stage). Data source: PRB entry to Nannotax
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: PRB entry to Nannotax

Plot of occurrence data:

References:

Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs V O

Bralower, T. J. & Self-Trail, J. (2016). Nannoplankton malformation during the Paleocene-Eocene Thermal Maximum and its paleoecological and paleoceangraphic significance. Paleoceanography. 31: 1-17. gs

Bybell, L. M. & Self-Trail, J. (1995). Evolutionary, biostratigraphic and taxonomic study of calcareous nanofossils from a continuous Palaeocene-Eocene boundary section in New Jersey. U.S. Geological Survey, Professional Paper. 1554: 1-36. gs V O

Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs V O

Self-Trail, J. M., Powars, D. S., Watkins, D. K. & Wandless, G. A. (2012). Calcareous nannofossil assemblage changes across the Paleocene–Eocene Thermal Maximum: Evidence from a shelf setting. Marine Micropaleontology. 92–93: 61-80. gs


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Discoaster anartios compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-9-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=445 Go to Archive.is to create a permanent copy of this page - citation notes



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