Nannotax3 - ntax_cenozoic - Pontosphaera romansii

Pontosphaera romansii

Classification: ntax_cenozoic -> Zygodiscales -> Pontosphaeraceae -> Pontosphaera -> Pontosphaera romansii
Sister taxa: << < 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, P. pax ⟩⟨> >>

BownNewsam 2017 pl06 17-20.JPG
BownNewsam 2017 pl06 21.JPG

Taxonomy:

Citation: Pontosphaera romansii Bown & Newsam 2017

Rank: Species

Distinguishing features: Large, narrowly elliptical, lens-shaped pontosphaerid with high rim and apparently vacant central area.

Farinacci & Howe catalog pages: P. romansii *

Morphology: Large, narrowly elliptical, lens-shaped pontosphaerid with high rim and apparently vacant central area.
Differentiation: Distinguised from other pontosphaerids by the high, lens-shaped rim. [Bown & Newsam 2017]

Size: Holotype L = 10.5μm (Paratype L = 11.9μm). [Bown & Newsam 2017]

Search data:

Tags	LITHS: murolith, elliptical, CA: vacant, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 9->13µm; 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 NP15b subzone (44.12-45.49Ma, 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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(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 V O

Pontosphaera romansii 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=1096 Go to Archive.is to create a permanent copy of this page - citation notes

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