Pontosphaera japonica


Classification: Coccolithophores -> 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: Discolithina japonica * , Discolithina millepuncta * , Pontosphaera decorata *


Morphology remarks: 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, RIM: outer wall acw-imbricate, rim-low, CA: pores,
CSPH: spherical, equant, monomorphic, V-UNITS: outer-rim, V-prominent, R-UNITS: c-str, inner-rim, px-plate, R-prominent, DETAILS: ca_conjunct, isogyres oblique, isogyres separated, rim-unicyclic,
MetricsLith size: 8->12µm; Liths per sphere: 10->20
Sources: 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:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Pontosphaera japonica, synonyms included - Discolithina japonica; Discolithina millipuncta; Discolithina scutellum; Pontosphaera decorata; Pontosphaera japonica; Pontosphaera millepuncta; Pontosphaera scutellum; Syracosphaera japonica;
  • space-time plot :: Samples map :: Parent: Pontosphaera

    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. Paleontological Contributions, University of Kansas. 29: 1-7. gs :: ::

    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 :: ::

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

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

    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 :: view :: open


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    Pontosphaera japonica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 4-6-2020

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    Short stable page link: http://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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