Nannotax3 - ntax_mesozoic - Cyclagelosphaera rotaclypeata

Cyclagelosphaera rotaclypeata


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

Distinguishing features:
Parent taxon (Cyclagelosphaera): Circular watznaueriacean coccoliths.
This taxon: 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: C. rotaclypeata * , C. specioclypeata *

Distinguishing features:
Parent taxon (Cyclagelosphaera): Circular watznaueriacean coccoliths.
This taxon: Circular, with relatively wide central area filled with radial elements forming a coarse grill or plate.


Morphology:

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.


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: placolith, circular, CA: ca_conjunct, plate, closed,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith size: 5->8µm;
Data source notes: 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:

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. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O

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

Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. 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 O

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

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 O


nannotaxlogo400px

Cyclagelosphaera rotaclypeata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-12-2022

Taxon Search:
Advanced Search

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



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics