Sphenolithus anarrhopus


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

Taxonomy:

Citation: Sphenolithus anarrhopus Bukry & Bramlette, 1969
Rank: Species
Taxonomic discussion: Similar to Sphenolithus radians but the spine is completely dark at 0°.

Distinguishing features: Medium sized (height 6.2-9.2 µm) with short to relatively long spine that is slightly asymmetrical and dark at 0°. Square-shaped base with near-equidimensional quadrants and deep spine insertion.

Farinacci & Howe catalog pages: S. anarrhopus *

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 5->9µm;
Data source notes: lith height from OD & Bown 2005
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Lowest common occurrence (LCO) in NP7 according to Agnini et al. 2007
Last occurrence (top): within NP10 zone (54.17-55.86Ma, top in Ypresian stage). Data source: Perch-Nielsen 1985b
First occurrence (base): at top of NP5 zone (95% up, 59.6Ma, in Selandian stage). Data source: Agnini et al. 2007 fig. 9

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

Agnini, C., Fornaciari, E. & Raffi, I. (2008). Three new species of calcareous nannofossil from Late Palaeocene and Early Eocene assemblages (Ocean Drilling Program Site 1262, Walvis Ridge, SE Atlantic Ocean). Journal of Nannoplankton Research. 30(1): 51-56. gs V O

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

Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs V O

Bukry, D. & Bramlette, M. N. (1969b). Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology. 7: 131-142. gs V O

Bybell, L. M. & Self-Trail, J. (1995). Evolutionary, biostratigraphic and taxonomic study of calcareous nanofossils from a continuous Palaeocene-Eocene boundary section in New Jersey. U.S. Geological Survey, Professional Paper. 1554: 1-36. gs V O

Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V O

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs V O


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Sphenolithus anarrhopus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-7-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1281 Go to Archive.is to create a permanent copy of this page - citation notes



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