Watznaueria barnesiae


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

Short diagnosis: Watznaueria with central-area that is closed or very narrow, with no central area structures.


Taxonomy:

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

Farinacci & Howe catalog pages: Actinosphaera deflandrei * Calolithus elongatus * Calolithus formosus * Caterella perstrata * Coccolithus bidentatus * Coccolithus bornholmensis * Coccolithus coronatus * Coccolithus hoellvikensis * Coccolithus paenepelagicus * Coccolithus perforatus * Ellipsagelosphaera arata * Ellipsagelosphaera forbesii * Margolatus manivitae * Tremalithus barnesae * Tremalithus barnesiae [no catalog entry yet]Watznaueria angustoralis * Watznaueria coronata + * Watznaueria praerupta *

Short diagnosis: Watznaueria with central-area that is 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:

References:

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

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

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

Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.

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.

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.

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.

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

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


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Watznaueria barnesiae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-12-2017

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Comments (2)

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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 ?
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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.
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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 ?
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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. [
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