Micula concava


Classification: Mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Micula -> Micula concava
Sister taxa: M. staurophora, M. adumbrata, M. concava, M. cubiformis, M. swastica, M. murus, M. prinsii, M. clypeata, M. praemurus, M. premolisilvae, M. sp.,

Distinguishing features: Like M. staurophora but with markedly concave faces 


Taxonomy:

Citation: Micula concava (Stradner in Martini & Stradner, 1960) Verbeek, 1976
Rank: Species
Basionym: Nannotetraster concavus Stradner in Martini & Stradner, 1960
Synonyms: Micula decussata concava (Stradner) Bukry; Micula staurophora concava
Notes & discussion: Generally regarded as well-presrved variant of M. staurophora 

Farinacci & Howe catalog pages: Nannotetraster concavus *

Distinguishing features: Like M. staurophora but with markedly concave faces 

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): in lower part of UC11c subzone (40% up, 86.1Ma, in Coniacian stage). Data source: Burnett 1998, fig 6.4

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: Micula concava, synonyms included - Micula concava; Micula staurophora concava;
  • space-time plot :: Samples map :: Parent: Micula

    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

    Martini, E. & Stradner, H. (1960). Nannotetraster, eine stratigraphisch bedeutsame neue Discoasteridengattung. Erdoel-Zeitschrift. 76(8): 266-270. gs

    Stradner, H., Aubry, M. -P. & Bonnemaison, M. (2010). Calcareous nannofossil type specimens in the collection of the Geological Survey of Austria: A taxonomic and stratigraphic update. Jahrbuch der Geologischen Bundesanstalt. 150(1-2): 9-84. gs

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

    Verbeek, J. W. (1976b). Upper Cretaceous nannoplankton zonation in a composite section near El Kef, Tunisia. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. B79: 129-148. gs

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    Micula concava compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-12-2019

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