Discoaster araneus


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

Taxonomy:

Citation: Discoaster araneus Bukry, 1971
Rank: Species
Basionym: Discoaster araneus Bukry, 1971
Synonyms:
Notes & discussion: PETM excursion taxon. Bralower & Self-Trail (2016) argue that this is better regarded as a sub-species of D. salisburgensis.

Distinguishing features: 7-9 rays. Large to very large, typically asymmetric discoaster with a prominent boss on one side and 7-9 tapering rays that have variable curvature and free length (1/3 to 2/3 of total ray length).

Farinacci & Howe catalog pages: D. araneus *

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: 7->13;
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:

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

Bukry, D. (1971a). Discoaster evolutionary trends. Micropaleontology. 17: 43-52. gs

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


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Discoaster araneus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=446 Go to Archive.is to create a permanent copy of this page - citation notes



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