Sphenolithus radians


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

Taxonomy:

Citation: Sphenolithus radians Deflandre in Grassé, 1952
Rank: Species

Distinguishing features: Medium to large sized (height 6.6-12.1 µm) with a tall compound spine and square shaped base with equidimensional quadrants. The spine is dark but visible at 0° and characterized by a median suture line; at 45° the spine is brightest. Narrow spine endings up to three times the length of the main sphenolith have been rarely observed (up to 38 µm).

Farinacci & Howe catalog pages: Sphenolithus radians * , ,

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: 6->12µm;
Sources: lith height from Bown (2005)
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: Bown & Dunkley Jones, 2012
First occurrence (base): at base of NP11 zone (0% up, 54.2Ma, in Ypresian stage). Data source: Agnini et al. 2007, fig. 4

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 radians, synonyms included - Sphenolithus radians; space-time plot :: Samples map :: Parent: S. radians group

    References:

    Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Rohl, U. & Westerhold, T. (2007). 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

    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

    Deflandre, G. (1952). Classe des Coccolithophoridés. (Coccolithophoridae. Lohmann, 1902). In, Grassé, P. P. (ed.) Traite de Zoologie. Masson, Paris 439-470. gs


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    Sphenolithus radians compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1317 Go to Archive.is to create a permanent copy of this page - citation notes



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