Pontosphaera hollisii


Classification: Coccolithophores -> Zygodiscales -> Pontosphaeraceae -> Pontosphaera -> Pontosphaera hollisii
Sister taxa: << < P. geminipora, P. longiforaminis, P. megapachydisca, P. veta, P. syracusana, P. alta, P. panarium, P. versa, P. wallacei, P. latoculata, P. sp.A, P. formosa, P. wechesensis, P. fimbriata, P. brinkhuisii, 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, > >>

Taxonomy:

Citation: Pontosphaera hollisii Bown & Newsam 2017
Rank: Species

Distinguishing features: Very large, broadly elliptical with broad, low rim and narrow to closed central opening.

Farinacci & Howe catalog pages: Pontosphaera hollisii *


Morphology remarks: Very large, broadly elliptical pontosphaerid with broad, low rim and narrow to closed central area. The rim is pale grey in cross-polarised light.
Differentiation: Distinguised from other Pontosphaera by larger size, broad rim cycle and low birefringence in cross-polarised light. [Bown & Newsam 2017]

Size: Holotype L = 18.1μm (Paratype L = 18.3μm). [Bown & Newsam 2017]

Search data:
TagsLITHS: murolith, elliptical, RIM: flange-distal, outer wall acw-imbricate, CA: Placoliths: closed-----, closed,
CSPH: not known, V-UNITS: outer-rim, V-prominent, R-UNITS: all, c-str, distal shield, inner-rim, px-plate, R-prominent, DETAILS: rim-bicyclic, isogyres oblique, isogyres separated,
MetricsLith size: 16->20µm;
Sources: lith size from OD and slightly extended
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP15c subzone (42.87-44.12Ma, top in Lutetian stage). Data source: Bown & Newsam 2017
First occurrence (base): within NP15b subzone (44.12-45.49Ma, base in Lutetian stage). Data source: Bown & Newsam 2017

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) 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


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    Pontosphaera hollisii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 4-6-2020

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1076 Go to Archive.is to create a permanent copy of this page - citation notes



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