Nannotax3 - ntax_cenozoic - Sphenolithus puniceus

Sphenolithus puniceus


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

Taxonomy:

Citation: Sphenolithus puniceus Bergen & de Kaenel, in Bergen et al. 2017
Rank: Species

Taxonomic discussion:
Very large moriformis-like sphenoliths are a sporadic but distinctive component of Early Miocene sphenolith assemblages. Separating them as S. puniceus seems worthwhile [JRY my obs 2018]

Distinguishing features:
Parent taxon (S. moriformis group): Conical and hemispherical sphenoliths without prominent apical spines.
This taxon: Hemispherical, like S. moriformis but larger (7-11 µm) and therefore more birefringent (Oligocene - Early miocene)

Farinacci & Howe catalog pages: S. puniceus *


Morphology:

Medium to large, hemispherical sphenolith with a compound apical spine. The species is distinguished by its very high birefringence - exhibiting first order blue to red interference colors at its core in both plan and lateral view. [Bergen et al. 2017]. 

Most likely ancestor: Sphenolithus moriformis - at confidence level 3 (out of 5). Data source: Howe 2021, fig. 8.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CROSS-POLARS: R-prominent,
MetricsLith size: 7->11µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN4 zone (14.91-17.95Ma, top in Langhian stage). Data source: Bergen et al. 2017
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian 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

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

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


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Sphenolithus puniceus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-9-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1649 Go to Archive.is to create a permanent copy of this page - citation notes



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