Pontosphaera exilis


Classification: Coccolithophores -> Zygodiscales -> Pontosphaeraceae -> Pontosphaera -> Pontosphaera exilis
Sister taxa: << < P. hollisii, P. romansii, P. japonica, P. plana, P. rimosa, P. pectinata, P. wilsonii, P. punctosa, P. clinosulcata, P. perforomarginata, P. pulcheroides, P. pulchra, P. pygmaea, P. ocellata, P. duocava, P. exilis, P. pax, P. obliquipons, T. omarians, P. sp.,

Taxonomy:

Citation: Pontosphaera exilis (Bramlette & Sullivan, 1961) Romein, 1979
Rank: Species
Basionym: Discolithus exilis Bramlette & Sullivan, 1961
Synonyms: Discolithina rectipons Haq (1968) = Transversopontis rectipons (Haq 1968) Roth 1970

Distinguishing features: Simple unadorned plate with two large holes that define a transverse bar; the rim is narrow and not distinct in XPL. Hole size, and thus bar width, varies greatly. The bar is typically transverse but may be slightly oblique.

Farinacci & Howe catalog pages: Discolithus exilis * , Discolithina rectipons *

Search data:
TagsLITHS: murolith, elliptical, RIM: outer wall acw-imbricate, rim-low, CA: bar-diagonal, bar-diagonal NW-SE, pores, bar,
CSPH: not known, V-UNITS: outer-rim, V-prominent, R-UNITS: c-str, inner-rim, px-plate, R-prominent, DETAILS: ca_conjunct, rim-bicyclic, isogyres oblique, isogyres separated,
MetricsLith size: 5->12µm;
Sources: lith size from illustrated specimens (OD suggests can be larger)
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP17 zone (37.32-40.40Ma, top in Priabonian stage). Data source: Bown 2005
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian 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: Pontosphaera exilis, synonyms included - Pontosphaera exilis; Transversopontis exilis;
  • space-time plot :: Samples map :: Parent: Pontosphaera

    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 :: view :: open

    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 :: view :: open

    Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs :: view :: open

    Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(129-188): -. gs :: ::

    Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs :: view :: open

    Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 231-. gs :: ::

    Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs :: view :: open


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    Pontosphaera exilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-6-2020

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1072 Go to Archive.is to create a permanent copy of this page - citation notes



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