Sphenolithus cf. S. perpendicularis


Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. furcatolithoides group -> Sphenolithus cf. S. perpendicularis
Sister taxa: S. cuniculus, S. furcatolithoides, S. kempii, S. perpendicularis, S. cf. S. perpendicularis, S. strigosus

Taxonomy:

Citation: Sphenolithus cf. S. perpendicularis sensu Bown & Newsam 2017
Rank: Species

Distinguishing features: tapering base with narrow, high-angled lateral spines;

Farinacci & Howe catalog pages:


Morphology:

Short, squat sphenoliths with a base formed from broad, gently-tapering lower quadrants and smaller upper quadrants. Two long, narrow, lateral spines emerge from the upper quadrants making an angle of around 160° (80° to the sphenolith long axis).
Differentiation: The base is most similar to S. moriformis or S. spiniger but this species is distinguised from these by long lateral spines. The spines are most similar to S. furcatolithoides group sphenoliths, but are narrower and emerge from the base at a higher angle. [Bown & Newsam 2017]

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP15b subzone (44.12-45.49Ma, top in Lutetian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: Bown & Newsam 2017

Plot of occurrence data:

References:

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 cf. S. perpendicularis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-6-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1288 Go to Archive.is to create a permanent copy of this page - citation notes



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