Pontosphaera pulcheroides


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

Taxonomy:

Citation: Pontosphaera pulcheroides (Sullivan, 1964) Romein, 1979
Rank: Species
Basionym: Discolithus pulcheroides Sullivan, 1964
Synonyms:
Variants: Self-Trail (2011) separates P. pulchripora from P. pulcheroides based on the absence of marginal slits. However, this feature is only seen with good preservation and is not clear in the holotype of either species. [my interpretation - JRY 2019]. NB The names of both species reflect the fact that they are similar to P. pulchra - but have more oblique openings and marginal pores.

Distinguishing features: Pontosphaera with a row of small "pores" towards outer edge of plate and a large central opening spanned by an oblique tranverse bar. The "pores" appear as dark spots in LM and so look like openings, but in EMs it is clear they are depressions on the distal surface and do not extend to the proximal surface.

Farinacci & Howe catalog pages: D. pulcheroides * , D. pulchriporus *

Search data:
TagsLITHS: murolith, elliptical, CA: ca_conjunct, pores, bar, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 6->12µm;
Data source notes: lith size from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Self-Trail 2011
First occurrence (base): within NP12 zone (50.50-53.70Ma, base in Ypresian stage). Data source: Self-Trail 2011

Plot of occurrence data:

References:

Báldi-Beke, M. (1971). The Eocene nannoplankton of the Bakony Mountains, Hungary. Annales Instituti Geologici Publici Hungarici. 54(4): 13-38. gs

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

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

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

Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs V O

Sullivan, F. R. (1964). Lower Tertiary nannoplankton from the California Coast Ranges. I. Paleocene. University of California Publications in Geological Sciences. 44: 163-227. gs


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

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1090 Go to Archive.is to create a permanent copy of this page - citation notes



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