Sphenolithus runus


Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. radians group -> Sphenolithus runus
Sister taxa: S. arthurii, S. orphanknollensis, S. pseudoradians, S. radians, S. richteri, S. runus, S. spiniger

Taxonomy:

Citation: Sphenolithus runus Bown & Dunkley Jones, 2006
Rank: Species
Taxonomic discussion: Similar to Sphenolithus obtusus Bukry, 1971, but the spine does not show a split extinction pattern when rotated, and the basal quadrants appear larger, with distal extensions at 45°.

Distinguishing features: Spinose, dart-shaped sphenolith with a low base comprising a single cycle of triangular quadrants when viewed at 0°. The relatively tall, tapering spine is in extinction at 0° and bright at 45°. The quadrants appear larger, and are extended distally, at 45°.

Farinacci & Howe catalog pages: S. runus *

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: V-prominent, R-prominent,
MetricsLith size: 5->7µm;
Data source notes: lith height from OD and slightly extended
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Bown & Dunkley Jones, 2012
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Bown & Dunkley Jones, 2012

Plot of occurrence data:

References:

Bown, P. R. & Dunkley Jones, T. (2006). New Paleogene calcareous nannofossil taxa from coastal Tanzania: Tanzania Drilling Project Sites 11 to 14. Journal of Nannoplankton Research. 28(1): 17-34. gs V O

Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O

Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O


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Sphenolithus runus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1320 Go to Archive.is to create a permanent copy of this page - citation notes



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