Sphenolithus villae


Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. conspicuus group -> Sphenolithus villae
Sister taxa: S. anarrhopus, S. conspicuus, S. editus, S. rioi, S. villae

Taxonomy:

Citation: Sphenolithus villae Bown, 2005
Rank: Species

Distinguishing features: Large (height 7.5-19.8 µm) narrow sphenolith with a tall spine that is dark at 0°. Relatively tall base, with roughly equidimensional upper and lower quadrants. The spine indents deeply into the upper quadrants, appears to be monocrystalline, and is brightest at 45°.

Farinacci & Howe catalog pages: S. villae *

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 7->20µm;
Data source notes: lith height from OD
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Rare but esentially confined to NP11 (Agnini et al. 2007, fig. 4)
Last occurrence (top): near base of NP12 zone (10% up, 53.4Ma, in Ypresian stage). Data source: Agnini et al. 2007, fig. 4
First occurrence (base): at base of NP11 zone (0% up, 54.2Ma, in Ypresian stage). Data source: Agnini et al. 2007, fig. 4

Plot of occurrence data:

References:

Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007a). High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: Implications for calcareous nannoplankton evolution. Marine Micropaleontology. 64: 215-248. gs

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs V O


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Sphenolithus villae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1327 Go to Archive.is to create a permanent copy of this page - citation notes



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