Pontosphaera japonica


Classification: ntax_cenozoic -> Zygodiscales -> Pontosphaeraceae -> Pontosphaera -> Pontosphaera japonica
Sister taxa: << < 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 ⟩⟨ P. obliquipons> >>

Taxonomy:

Citation: Pontosphaera japonica (Takayama 1967) Nishida, 1971
Rank: Species
Basionym: Discolithina japonica Takayama 1967
Synonyms: Discolithina millepuncta Gartner, 1967 [according to Okada & McIntyre 1977] 
Pontosphaera decorata von Salis (1994) [my interpretation - JRY 2015]

Distinguishing features: Rim flush with central-area pores very small (<0.1µm) often infilled during diagenesis.

Farinacci & Howe catalog pages: D. japonica * , D. millepuncta * , P. decorata *


Morphology: Pores are very small (ca. 0.05µm), not visible in LM, in semi-regular array with ca. 10- 15 rows of pores on each side of the coccolith. Surrounding the central field of pores there is typically a zone of circular depressions and then a smooth zone.

Size: Coccospheres 17-21 µm


Biology & life-cycles: Frada et al. (2009) showed that P. japonica forms combination coccospheres with a previously undescribed holococcolith. This is similar to Syracolithus schilleri (shown to be the holococcolith phase of Scyphosphara apsteinii) but without an outer rim of radially disposed crystallites.

See also: Pontosphaera japonica HOL - holoccolith phase;Scyphosphaera apsteini - body coccoliths are similar;

Search data:
TagsLITHS: murolith, elliptical, CA: ca_conjunct, pores,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent,
MetricsLith size: 8->12µm; Liths per sphere: 10->20
Data source notes: lith size from illustrated specimens; lith numbers from Yang & Wei 2003, range inferred from single estimate
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Miocene Epoch (5.33-23.03Ma, base in Aquitanian stage). Data source: [JRY rough estimate]

Plot of occurrence data:

References:

Frada, M., Percopo, I., Young, J. R., Zingone, A., de Vargas, C. & Probert, I. (2009). First observations of heterococcolithophore-holococcolithophore life cycle combinations in the family Pontosphaeraceae (Calcihaptophycideae, Haptophyta). Marine Micropaleontology. 71(1): 20-27. gs

Gartner, S. (1967a). Calcareous nannofossils from Neogene of Trinidad, Jamaica, and Gulf of Mexico. University of Kansas Paleontological Contributions, Papers. 29: 1-7. gs V O

Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs

Reid, F. M. H. (1980). Coccolithophorids of the North Pacific Central Gyre with notes on their vertical and seasonal distribution. Micropaleontology. 26(2): 151-176. gs

Takayama, T. (1967). First report on nannoplankton of the Upper Tertiary and Quaternary of the southern Kwanto region, Japan. Jahrbuch der Geologischen Bundesanstalt. 110: 169-198. gs V O

von Salis, K. (1994). Some fossil “living coccolithophorid” species. Journal of Nannoplankton Research. 16(3): 109-114. gs V O

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue. 1: 1-132. gs V O


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Pontosphaera japonica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-4-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1077 Go to Archive.is to create a permanent copy of this page - citation notes



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