Classification: ntax_cenozoic -> Zygodiscales -> Pontosphaeraceae -> Pontosphaera -> Pontosphaera perforomarginata
Sister taxa: << < 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 〉〈 P. obliquipons, T. omarians 〉〈 P. sp.
Citation: Pontosphaera perforomarginata Bown, 2005Rank: Species
Distinguishing features: Large elliptical Pontosphaera with small pores and two central longitudinal holes separated by conjunct bar. The plate thickens towards the edge but the rim is difficult to distinguish in XPL.
Farinacci & Howe catalog pages: P. perforomarginata *
Morphology: The plate thickens towards the edge but the rim is difficult to distinguish in XPL.
The morphological data given here can be used on the advanced search page. See also these notes
|Tags||LITHS: murolith, elliptical, CA: ca_conjunct, pores, bar, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
|Metrics||Lith size: 7->10µm; |
Data source notes: lith size from OD and slightly extended
Last occurrence (top): within NP11 zone (53.70-54.17Ma, top in Ypresian stage). Data source: Bown 2005
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: Bown 2005
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
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 V O