Watznaueria barnesiae

Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Watznaueria -> Watznaueria barnesiae
Sister taxa: W. barnesiae, W. bayackii, W. fossacincta, W. manivitiae, W. ovata, W. britannica, W. reinhardtii, W. biporta, W. cynthae, W. contracta, W. okadai, W. quadriradiata, W. fasciata, W. rawsonii, C. baticlypeata, W. sp.,

Distinguishing features: Central-area closed or very narrow, with no central area structures.


Citation: Watznaueria barnesiae (Black in Black & Barnes, 1959) Perch-Nielsen, 1968
Rank: Species
Basionym: Tremalithus barnesiae Black in Black & Barnes, 1959

Farinacci & Howe catalog pages: Tremalithus barnesae * , Actinosphaera deflandrei * , Caterella perstrata * , Calolithus formosus * , Calolithus elongatus * , Coccolithus bidentatus * , Coccolithus bornholmensis * , Coccolithus coronatus * , Coccolithus hoellvikensis * , Coccolithus paenepelagicus * , Coccolithus perforatus * , Ellipsagelosphaera arata * , Ellipsagelosphaera forbesii * , Margolatus manivitae * , Watznaueria angustoralis * , Watznaueria coronata + * , Watznaueria praerupta *

Distinguishing features: Central-area closed or very narrow, with no central area structures.

Morphology remarks: In XPL the extinction gyres meet in the centre of the coccolith, forming a swastika-like extinction pattern, and do not separate on rotation.

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 NJT11 subzone (0% up, 168.2Ma, in Bathonian stage). Data source: Mattioli & Erba 1999, fig. 12 - zonal marker (Bown & Cooper 1998 record the FAD significantly lower, in NJ9)

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: Watznaueria barnesiae, synonyms included - Caterella perstrata; Tretosestrum perforatus; Watznaueria barnesae; Watznaueria barnesiae; Watznaueria coronata; Watznaueria paenepelagica; space-time plot :: Samples map :: Parent: Watznaueria


    Black, M. & Barnes, B. (1959). The structure of Coccoliths from the English Chalk. Geological Magazine. 96: 321-328. gs

    Black, M. (1971a). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs

    Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

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

    Forchheimer, S. (1970). Scanning electron microscope studies of some Cenomanian coccospheres and coccoliths from Bornholm (Denmark) and Köpingsberg (Sweden). Sveriges Geologiska Undersokning, Arsbok. 64(4): 1-43. gs

    Forchheimer, S. (1972). Scanning electron microscope studies of Cretaceous coccoliths from the Köpingsberg Borehole No. 1, SE Sweden. Sveriges Geologiska Undersökning; Series C. #668, 65: 1-141. gs

    Mattioli, E. & Erba, E. (1999). Synthesis of calcareous nannofossil events in Tethyan lower and middle Jurassic successions. Rivista Italiana di Paleontologia e Stratigrafia. 105(3): 343-376. gs

    Noël, D. (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Éditions du Centre National de la Recherche Scientifique, Paris. -. gs

    Perch-Nielsen, K. (1968c). Der Feinbau und die Klassifikation der Coccolithen aus dem Maastrichtien von Danemark. Biologiske Skrifter. Kongelige Danske Videnskabernes Selskab. 16: 1-96. gs


    Watznaueria barnesiae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-8-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11299 Go to Archive.is to create a permanent copy of this page - citation notes

    Comments (2)

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    Page 1 of 1
    H K Sabot (AMD, India)
    Why W barnesae has less abundance in Coniacian, although it being a resistant ? whether reproductivity is low or sea regressed at that time ?
    Jeremy Young (UCL, UK)
    There does seem to be a reduction in the frequency of W. barnesiae in the Coniacian but you should look at this as an indication that there may be something happening rather than definite proof, it may just be noise in the data. Interestingly though there is also an increase in the frequency records in W. biporta, W. communis and W. brittannica at this time - so one possibility is that forms with a bar replace W. barnesiae at this time in some environments. It could be interesting to try and follow this up.
    Alessandro Menini (Univesité Claude Bernard Lyon, France)
    Very nice job here. I was curious about the species of Zeugrhabdotus in pic JRYlm-Wb16.JPG. Which species is it ?
    Jeremy Young (UCL, UK)
    Thanks for the feedback, always appreciated. The image you mention is one I took a long time ago but i think from Early Maastrichtian or Late Campanian of Tunisia. Zeugrhadotus taxonomy is problematic but Z. sigmoides would be a normal identification fro this, and Jackie Lees conformed this. [
    Page 1 of 1

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