Nannotax3 - ntax_cenozoic - Sphenolithus apoxis

Sphenolithus apoxis


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

Taxonomy:

Citation: Sphenolithus apoxis Bergen & de Kaenel, in Bergen et al. 2017
Rank: species

Taxonomic discussion:
Bergen et al. (2017) propose this taxon for S. abies-like specimens occurring in the Oligocene and early Miocene.
For most purposes it would be easier to include such specimens within S. moriformis. [my interpretation - JRY 2021]

Distinguishing features:
Parent taxon (S. moriformis group): Conical and hemispherical sphenoliths without prominent apical spines.
This taxon: Conical sphenolith with a compound apical spine. (like S. abies but older)

Farinacci & Howe catalog pages: S. apoxis *

Most likely ancestor: Sphenolithus moriformis - at confidence level 3 (out of 5). Data source: Howe 2021, fig. 9.
Likely descendants: Sphenolithus bipedis; Sphenolithus conicus; Sphenolithus truaxii; plot with descendants

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, 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 NN3 zone (17.95-19.00Ma, top in Burdigalian stage). Data source: Bergen et al 2017
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: Bergen et al 2017

Plot of occurrence data:

References:

Bergen, J. A., de Kaenel, E., Blair, S. A., Boesiger, T. M. & Browning, E. (2017). Oligocene-Pliocene taxonomy and stratigraphy of the genus Sphenolithus in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research. 37(2-3): 77-112. gs V O

Howe, R. (2021). Ultrastructure and taxonomy of the family Sphenolithaceae. Journal of Nannoplankton Research. 39(1): 29-75. gs


nannotaxlogo400px

Sphenolithus apoxis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1615 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