Watznaueria britannica


Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Watznaueria -> Watznaueria britannica
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: Watznaueria with narrow central-area spanned by a transverse bar.

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Taxonomy:

Citation: Watznaueria britannica (Stradner, 1963) Reinhardt, 1964
Rank: Species
Basionym: Coccolithus britannicus Stradner, 1963
Variants: Notes & discussion: The name W. communis is probably best regarded as a junior synonym or variant of Watznaueria britannica (Stradner, 1963) Reinhardt, 1964. Most authors do not separate the taxa but the distinct obliquity shown in the type specimen is a possible basis for separation.

A few authors, e.g. Casellato (2010) have used the name W. communis for a morphotype with an optically continuous bridge which nearly fills the central area. Whilst this morphotype is probably worth distinguishing it does not correspond to the holotype of W. communis and so it should be given a different name. The specimens illustrated by Casellato (2010) are now included in Watznaueria sp. 
Synonyms:
Notes & discussion: According to de Kaenel (oral comm. during 2016 Jurassic workshop) some industry workers use the name W. frequens for small early forms of W. britannica with a narrow opening. This taxon concept is very close to that of Lotharingius frodoi and the latter name seems preferable, both because the name E. frequens has been widely used with other meanings and because its holotype does not clearly fit this concept.

Farinacci & Howe catalog pages: Coccolithus britannicus * Ellipsagelosphaera frequens * Ellipsagelosphaera gephyrocapsoides * Ellipsagelosphaera lucasi * Watznaueria communis *

Distinguishing features: Watznaueria with narrow central-area spanned by a transverse bar.


Morphology remarks: Often the dominant coccolith in Middle and Upper Jurassic assemblages, becoming rarer in the lower Cretaceous.

Geological Range:
Last occurrence (top): within UC1a subzone (100.03-100.45Ma, top in Cenomanian stage). Data source: Burnett 1998
First occurrence (base): at base of NJ9 zone (0% up, 170.1Ma, in Bajocian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event

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
  • Taxon plotted: Watznaueria britannica, synonyms included - Ellipsagelosphaera britannica; Ellipsagelosphaera communis; Ellipsagelosphaera frequens; Watznaueria britannica; Watznaueria communis; Watznaueria frequens; space-time plot :: Samples map :: Parent: Watznaueria

    References:

    Bown, P.R. & Cooper, M.K.E., (1998). Jurassic. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.GS

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

    Stradner, H., (1963). New contributions to Mesozoic stratigraphy by means of nannofossils. Proceedings of the Sixth World Petroleum Congress, Section 1 Paper 4: 167-183.GS

    Young, J.R. & Bown, P.R., (1991). An ontogenetic sequence of coccoliths from the Late Jurassic Kimmeridge Clay of England. Palaeontology, 34: 843-850.GS

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    Watznaueria britannica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2019

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    Comments (1)

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    maryam (Iran)
    many thanks for pictures and diagnosis but I have encountered a problem for centrifuge time.
    What time could be better for centrifuge? I did 30 seconds.
    Gravatar
    Jeremy Young (UCL, UK)
    Hi Maryam
    Centrifuging is not a very precise preparation technique with nannos and times will vary between centrifuges. Actually few workers use centrifugation now.
    Jeremy
    Notify Me
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