Nannotax3 - ntax_cenozoic - Sphenolithus acervus

Sphenolithus acervus


Classification: ntax_cenozoic -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. moriformis group -> Sphenolithus acervus
Sister taxa: S. abies, S. apoxis, S. moriformis ⟩⟨ S. grandis, S. puniceus, S. acervus ⟩⟨ S. primus

Taxonomy:

Citation: Sphenolithus acervus Bown, 2005
Rank: Species

Distinguishing features:
Parent taxon (S. moriformis group): Conical and hemispherical sphenoliths without prominent apical spines.
This taxon: Large (>8.0µm) globular, coarsely-constructed sphenolith without a spine. (Palaeocene - Early Eocene)

Farinacci & Howe catalog pages: S. acervus *


Morphology:


Size:

Most likely ancestor: Sphenolithus primus - at confidence level 3 (out of 5). Data source: Howe 2021, fig. 9.

Search data:
LITHS: nannolith-radiate, circular, cylindrical, CROSS-POLARS: R-prominent,
Lith size: 8->12µm;
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 NP12 zone (50.50-53.70Ma, top in Ypresian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP6 zone (58.97-59.54Ma, base in Selandian stage). Data source: [PRB rough estimate]

Plot of occurrence data:

References:

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 O


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Sphenolithus acervus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-9-2022

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1279 Go to Archive.is to create a permanent copy of this page - citation notes



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