Sphenolithus perpendicularis


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

Taxonomy:

Citation: Sphenolithus perpendicularis Shamrock 2010
Rank: Species

Distinguishing features: square base with two spines that diverge by around 90°

Farinacci & Howe catalog pages: S. perpendicularis *


Morphology: Sphenolith with a small- to medium-sized base, bearing two tapering, apical spines that diverge to ~90° just above the basal cycles

Size: Base width 3-5µm; Spine height 2-8.5µm (Shamrock 2010)

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 2->8.5µm;
Data source notes: lith height from ODs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP15 zone (42.87-46.29Ma, top in Lutetian stage). Data source: Bown & Dunkley Jones, 2012
First occurrence (base): within NP15 zone (42.87-46.29Ma, base in Lutetian stage). Data source: Bown & Dunkley Jones, 2012

Plot of occurrence data:

References:

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

Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs

Shamrock, J. L. (2010). A new calcareous nannofossil species of the genus Sphenolithus from the Middle Eocene (Lutetian) and its biostratigraphic significance. Journal of Nannoplankton Research. 31(1): 5-10. gs V O


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Sphenolithus perpendicularis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-8-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1310 Go to Archive.is to create a permanent copy of this page - citation notes



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