Cyclagelosphaera rotaclypeata


Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Cyclagelosphaera -> Cyclagelosphaera rotaclypeata
Sister taxa: C. margerelii, C. alta, C. reinhardtii, C. rotaclypeata, C. shenleyensis, C. argoensis, C. brezae, C. centrumelliptica, C. deflandrei, C. jiangii, C. lacuna, C. wiedmannii, C. sp.,

Distinguishing features: Circular, with relatively wide central area filled with radial elements forming a coarse grill or plate.


Taxonomy:

Citation: Cyclagelosphaera rotaclypeata Bukry, 1969
Rank: Species
Synonyms:

Farinacci & Howe catalog pages: Cyclagelosphaera rotaclypeata * , Cyclagelosphaera specioclypeata *

Distinguishing features: Circular, with relatively wide central area filled with radial elements forming a coarse grill or plate.


Morphology remarks: The plate is thinner than the shields and so in LM it shows lower birefringence - in contrast to the bright plug in e.g. C. reinhardtii.

Size: Type diameter 6.4µm.

Search data:
TagsLITHS: placolith, circular, CA: plate, closed,
CSPH: equant, monomorphic, R-UNITS: R-prominent, DETAILS: ca_conjunct, rim-unicyclic,
MetricsLith size: 5->8µm;
Sources: original descriptions & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

See also: Cyclagelosphaera baticlypeata - rather similar but broadly elliptical and with a grill rather than plate;

Geological Range:
Last occurrence (top): within NP1 zone (65.47-66.04Ma, top in Danian stage). Data source: Burnett 1998
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: Burnett 1998

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: Cyclagelosphaera rotaclypeata, synonyms included - Cyclagelosphaera rotaclypeata;
  • space-time plot :: Samples map :: Parent: Cyclagelosphaera

    References:

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

    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 :: ::

    Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs :: ::

    Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. gs :: ::

    Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs :: view :: open

    Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs :: view :: open

    Verbeek, J. W. (1977). Calcareous nannoplankton biostratigraphy of Middle and Upper Cretaceous deposits in Tunisia, southern Spain and France. Utrecht Micropaleontological Bulletin. 16: 1-157. gs :: ::


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    Cyclagelosphaera rotaclypeata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10349 Go to Archive.is to create a permanent copy of this page - citation notes



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