Discoaster salisburgensis var. villosus


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

Taxonomy:

Citation: Discoaster salisburgensis var. villosus Bralower & Self-Trail 2016
Rank: variety
Taxonomic discussion: This variety was described in the supplementary infirmation to Bralower & Self-Trail 2016.
Derivation of Name: From the Latin villosus, meaning shaggy, refering to the unkempt appearance of the irregularly shaped rays

Distinguishing features: 10-14 rays.

Farinacci & Howe catalog pages: D. salisburgensis villosus *


Morphology: Discoaster salisburgensis var. villosus is a medium to large Discoaster that has 10-14 asymmetrically spaced, sharply tapering rays with a variable free ray length that can be ½ to 2/3 of the total ray length. Some rays have the appearance of being partially melded together and some rays appear to bend into a different plane, making photography difficult (Fig. 4, 17). A prominent knob is present on one side of the nannolith.
Differentiation: Discoaster salisburgensis var. villosus most closely resembles D. salisburgensis var. anartios, which also has irregularly shaped rays and a prominent knob. However. D. salisburgensis var. anartios has more rays (15-20) and the free ray length is significantly less than that exhibited by D. salisburgensis var. villosus

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

Search data:
TagsLITHS: nannolith-radiate, star-shaped, CA: process, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 18->23┬Ám; Segments: 10->14;
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:
Notes: Confined to the Palecene Eocene Thermal Maximum carbon isotope excursion interval (PETM-CIE)
Last occurrence (top): within NP10 zone (54.17-55.86Ma, top in Ypresian stage). Data source: Bralower & Self-Trail 2016
First occurrence (base): within NP9b subzone (55.86-56.66Ma, base in Thanetian stage). Data source: Bralower & Self-Trail 2016

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


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Discoaster salisburgensis var. villosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=499 Go to Archive.is to create a permanent copy of this page - citation notes



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