Sphenolithus kempii


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

Taxonomy:

Citation: Sphenolithus kempii Bown & Dunkley Jones, 2012
Rank: Species
Taxonomic discussion: S. kempii has a morphology intermediate between the single spined S. radians and the two-spined S. perpendicularis and S. furcatolithoides, and may be ancestral to these forms.

Distinguishing features: square base with 3 or 4 spines

Farinacci & Howe catalog pages: S. kempii *


Morphology: Three (or possibly four) long spines and square base. At 0° the two outer spines are bright, the middle spine is dark and the base is bright. At 45° the middle spine is bright, the two outer spines are dark and the base is darker and crossed by X-shaped extinction lines.

Size: Holotype length 5.3 microns

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 4->6µm;
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 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

Fioroni, C., Villa, G., Persico, D. & Jovane, L. (2015). Middle Eocene-Lower Oligocene calcareous nannofossil biostratigraphy and paleoceanographic implications from Site 711 (equatorial Indian Ocean). Marine Micropaleontology. 118: 50-62. gs


nannotaxlogo400px

Sphenolithus kempii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-6-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1302 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics