Placozygus spiralis


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Placozygus -> Placozygus spiralis
Sister taxa: P. banneri, P. fibuliformis, P. spiralis, P. sp.,


Taxonomy:

Citation: Placozygus spiralis (Bramlette & Martini, 1964) Hoffmann, 1970
Rank: Species
Basionym: Zygodiscus spiralis Bramlette & Martini, 1964
Synonyms:

Farinacci & Howe catalog pages: Zygodiscus spiralis *

Search data:
TagsLITHS: murolith, elliptical, CA: process, bar, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 4->8µm;
Sources: original description & 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 Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Coniacian Stage (86.26-89.77Ma, base in Coniacian stage). Data source: Burnett 1998

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: Placozygus spiralis, synonyms included - Placozygus spiralis; Zeugrhabdotus spiralis; Zygodiscus spiralis;
  • space-time plot :: Samples map :: Parent: Placozygus

    References:

    Bramlette, M. N. & Martini, E. (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology. 10(2): 291-322. gs

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

    Hoffmann, N. (1970a). Placozygus n. gen. (Coccolithineen) aus der Oberkreide des nordlichen Mitteleuropas. Geologie. 19: 1004-1009. gs

    Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs

    Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program. Scientific Results. 113: 465-487. gs

    Varol, O. & Girgis, M. (1994). New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 192: 221-253. gs


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

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10912 Go to Archive.is to create a permanent copy of this page - citation notes



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