Pontosphaera obliquipons


Classification: ntax_cenozoic -> Zygodiscales -> Pontosphaeraceae -> Pontosphaera -> Pontosphaera obliquipons
Sister taxa: << < 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.

Taxonomy:

Citation: Pontosphaera obliquipons (Deflandre in Deflandre & Fert, 1954) Romein, 1979
Rank: Species
Basionym: Discolithus obliquipons Deflandre in Deflandre & Fert, 1954
Variants:
Various similar species have been described, mostly from the Oligocene , but none of them are commonly recorded.
Taxonomic discussion: This is the default identification for "Tranversopontis" specimens with smooth rim.

Distinguishing features: Elongate Pontosphaera with distinctly oblique disjunct bar and elongate openings

Farinacci & Howe catalog pages: D. obliquipons * , T. latus * , T. prava * , T. sigmoidalis *


Morphology: Simple unadorned plate with a large central hole spanned by a crystallographically-disjunct oblique bar. The bar is birefringent at 0° (i.e. when the coccolith is orientated parallel to the polarising directions of the microscope) and dark at 10°.

Search data:
TagsLITHS: murolith, elliptical, CA: ca_conjunct, pores, bar, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 5->10µm;
Data source notes: lith size from ODs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP14 zone (46.29-49.11Ma, base in Ypresian stage). Data source: [PRB rough estimate]

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

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

Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs V O

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs V O

Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 30(1): 57-79. gs V O

Locker, S. (1967c). Neue, statigraphisch wichtige Coccolithophoriden (Flagellata aus dem norddeutschen Altetiar). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 9(9-10): 758-769. gs

Müller, C. (1970b). Nannoplankton-Zonen der Unteren-Meeresmolasse Bayerns. Geologica Bavarica. 63: 107-118. gs V O

Perch-Nielsen, K. (1967b). Nannofossilien aus dem Eozan von Danemark. Eclogae Geologicae Helvetiae. 60: 19-32. gs V O

Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs V O

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs V O


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Pontosphaera obliquipons compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1083 Go to Archive.is to create a permanent copy of this page - citation notes



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