Placozygus fibuliformis


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

Distinguishing features: Like P. spiralis but bar fills less of central area and formed of multiple elements


Taxonomy:

Citation: Placozygus fibuliformis (Reinhardt, 1964) Hoffmann, 1970
Rank: Species
Basionym: Glaukolithus? fibuliformis Reinhardt, 1964
Synonyms: Zygodiscus fibuliformis

Farinacci & Howe catalog pages: Glaukolithus fibuliformis *

Distinguishing features: Like P. spiralis but bar fills less of central area and formed of multiple elements

Search data:
TagsLITHS: murolith, elliptical, CA: process, bar, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 5->7µm;
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): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): at base of UC9b subzone (0% up, 90.7Ma, in Turonian stage). Data source: Burnett 1998, fig.6.3

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

    References:

    Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs

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

    Hardas, P. & Mutterlose, J. (2008). Calcareous nannofossil assemblages of Oceanic Anoxic Event 2 in the equatorial Atlantic: Evidence of an eutrophication event. Marine Micropaleontology. 66: 52-69. gs

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

    Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program. Scientific Results. 198: 1-60. 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

    Reinhardt, P. (1964). Einige Kalkflagellaten-Gattungen (Coccolithophoriden, Coccolithineen) aus dem Mesozoikum Deutschlands. Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 6: 749-759. gs

    Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 30(1): 39-56. gs


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    Placozygus fibuliformis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-3-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10910 Go to Archive.is to create a permanent copy of this page - citation notes



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