Pontosphaera hollisii


Classification: ntax_cenozoic -> 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: P. hollisii *


Morphology: 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, CA: closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 16->20µm;
Data source notes: 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:

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 V O

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Pontosphaera hollisii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-2-2021

Taxon Search:
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Short stable page link: https://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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