Sphenolithus spiniger


Classification: Coccolithophores -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. radians group -> Sphenolithus spiniger
Sister taxa: S. arthurii, S. orphanknollensis, S. pseudoradians, S. radians, S. richteri, S. runus, S. spiniger,

Short diagnosis: Small to medium sized (height 4.0-9.4 µm) with short spine, narrow triangular shape (dart shaped). Lower quadrants are largest and the compound spine is dark at 0°.


Taxonomy:

Citation: Sphenolithus spiniger Bukry, 1971
Rank: Species

Farinacci & Howe catalog pages: Sphenolithus spiniger *

Short diagnosis: Small to medium sized (height 4.0-9.4 µm) with short spine, narrow triangular shape (dart shaped). Lower quadrants are largest and the compound spine is dark at 0°.

Search data:
TagsLITHS: nannolith-radiate, N: 3D-radiate, conical, circular, PROCESS: length-fast, multicrystalline, spine,
CSPH: not known, R-UNITS: all, lower-tier, spine, middle-tier, DETAILS: isogyres radial,
MetricsLith size: 4->8µm;
Sources: lith height from OD and illustrated specs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: See comments below for discussion of LAD
Last occurrence (top): within NP17 zone (37.32-40.40Ma, top in Priabonian stage). Data source: Fornaciari et al, 2010
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

References:

Bukry, D., (1971). Cenozoic calcareous nannofossils from the Pacific Ocean. San Diego Society of Natural History Transactions, 16: 303-327.

Fornaciari, E.; Agnini, C.; Catanzariti, R.; Rio, D.; Bolla, E.M. & Valvasoni, E., (2010). Mid- Latitude calcareous nannofossil biostratigraphy and biochronology across the middle to late Eocene transition. Stratigraphy, 7(4): 229-264.

Perch-Nielsen, K., (1985). Cenozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 427-555.


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Sphenolithus spiniger compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2017

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Comments (1)

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Alonso Rincon (Instituto Mexicano del Petróleo, Mexico)
Hello everyone. Some authors placed the extinction of S. spiniger in the biozone NP15 (Bown, 2005), but others authors in the biozone NP17 (Fornaciari et al, 2010; Shamrock 2010; Fensome, 2008; Toffanin et al, 2013. This can be attributed to the different geographical areas of studies? Greetings!!
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Jeremy Young (UCL, UK)
Hi Alonso
Interesting question - however a quick check of Bown 2005 (Tanzania paper) shows that he is quoting the occurrences observed in that area and that they had a gap in coverage from NP15 to mid NP17 so his data is not incompatible with a consistent LAD in NP17. I will adjust the nannotax entry following the reference you cite.
Jeremy
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Alonso Rincon (Instituto Mexicano del Petróleo, Mexico)
thank you very much for your comments, I found it very helpful. Alonso.
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