Sphenolithus akropodus


Classification: Coccolithophores -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. predistentus group -> Sphenolithus akropodus
Sister taxa: S. ciperoensis, S. distentus, S. predistentus, S. patifunditus, S. bulbulus, S. tawfikii, S. celsus, S. peartiae, S. akropodus, S. tribulosus, S. directus, S. avis, S. umbrellus, S. triangularis, S. intercalaris, S. obtusus,

Taxonomy:

Citation: Sphenolithus akropodus de Kaenel and Villa, 1996
Rank: Species

Distinguishing features: Medium to large sphenolith with a long, robust, tapering apical spine, sometimes bifurcated, and short laterally extending proximal elements forming two pointed feet. In XPL the spine is bright at 45º and weakly birefringent at 0º.

Farinacci & Howe catalog pages: Sphenolithus akropodus *


Morphology remarks: Medium to large sphenolith with a long, tapering apical spine, sometimes bifurcated, and short laterally extending proximal elements forming two pointed feet. In XPL the spine is bright at 45º and weakly birefringent at 0º.

Search data:
TagsLITHS: nannolith-radiate, N: 3D-radiate, conical, circular, RIM: tiered, PROCESS: bifurcate, duocrystalline, length-fast, spine,
CSPH: not known, V-UNITS: spine, R-UNITS: lower-tier, DETAILS: isogyres radial,
MetricsLith size: 6->10µm;
Sources: lith height from OD, illustrated specs and Bergen et al. 2017
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP23 zone (29.62-32.02Ma, top in Rupelian stage). Data source: Bergen et al. 2017
First occurrence (base): within NP21 zone (32.92-34.44Ma, base in Priabonian stage). Data source: Bown & Dunkley Jones, 2012

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Sphenolithus akropodus, synonyms included - Sphenolithus akropodus; space-time plot :: Samples map :: Parent: S. predistentus group

    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

    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

    de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program. Scientific Results. 149: 79-145. gs

    Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs


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    Sphenolithus akropodus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-9-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1280 Go to Archive.is to create a permanent copy of this page - citation notes



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