Sphenolithus cuniculus


Classification: Coccolithophores -> Discoasterales -> Sphenolithaceae -> Sphenolithus -> S. furcatolithoides group -> Sphenolithus cuniculus
Sister taxa: S. cuniculus, S. furcatolithoides, S. kempii, S. perpendicularis, S. cf. S. perpendicularis, S. strigosus,

Taxonomy:

Citation: Sphenolithus cuniculus Bown, 2005
Rank: Species
Synonyms:
Notes & discussion: Similar to Sphenolithus furcatolithoides but lower quadrants shorter and upper quadrants broader: possibly a preservational variant.

Distinguishing features: forms with low basal quadrants (‘feet’) and ~90° bifurcations

Farinacci & Howe catalog pages: Sphenolithus cuniculus * , Sphenolithus furcatolithoides labradorensis *


Morphology remarks: Medium to large sphenolith with short lower quadrants and long upper quadrants that bifuracate.

See also: Sphenolithus furcatolithoides ;

Search data:
TagsLITHS: nannolith-radiate, N: 3D-radiate, conical, circular, cylindrical, RIM: tiered, CA: process, PROCESS: bifurcate, duocrystalline, length-fast, spine,
CSPH: not known, V-UNITS: none, R-UNITS: lower-tier, spine, middle-tier, R-prominent, DETAILS: isogyres radial,
MetricsLith size: 5->14µm;
Sources: lith height from ODs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP15 zone (42.87-46.29Ma, base in Lutetian stage). Data source: Bown 2005

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 cuniculus, synonyms included - Sphenolithus cuniculus; Sphenolithus furcatolithoides labradorensis;
  • space-time plot :: Samples map :: Parent: S. furcatolithoides group

    References:

    Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs

    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

    Firth, J. V. (1989). Eocene and Oligocene calcareous nannofossils from the Labrador Sea, ODP Leg 105. Proceedings of the Ocean Drilling Program. Scientific Results. 105: 263-286. gs

    Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs


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    Sphenolithus cuniculus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 27-2-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1293 Go to Archive.is to create a permanent copy of this page - citation notes



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