Classification: ntax_cenozoic -> Zygodiscales -> Pontosphaeraceae -> Pontosphaera -> Pontosphaera clinosulcata
Sister taxa: << < 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 〉〈 P. obliquipons, T. omarians 〉〈 P. sp.
- BownNewsam 2017 pl06 12.JPG
Citation: Pontosphaera clinosulcata Bown, 2005Rank: SpeciesTaxonomic discussion: Similar to P. pectinata but characterized by distinctly inclined pores and furrows.
Distinguishing features: Pontosphaera with plate that has oblique marginal furrows and oblique pores, and larger pores towards the centre; there may be two central longitudinal slits; rim narrow.
Farinacci & Howe catalog pages: P. clinosulcata *
Morphology: Medium to large elliptical Pontosphaera with a plate that is scalloped towards its outer edge. The scalloping is defined by narrow inclined ridges, which run inwards towards the centre. There are inclined furrows between the ridges and inclined elongate pores; there may be two central longitudinal slits. The rim is narrow and 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: pores, 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 NP15b subzone (44.12-45.49Ma, top in Lutetian stage). Data source: Bown 2005
First occurrence (base): within NP15b subzone (44.12-45.49Ma, base in Lutetian 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. & 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
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
Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs V O