Arkhangelskiella cymbiformis


Classification: Mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae -> Arkhangelskiella -> Arkhangelskiella cymbiformis
Sister taxa: A. confusa, A. cymbiformis, A. maastrichtiensis, A. paucipunctata, A. specillata, A. sp.,

Distinguishing features: Large sized (>8µm) with a narrow rim (<1.5µm)


Taxonomy:

Citation: Arkhangelskiella cymbiformis Vekshina, 1959
Rank: Species
Variants: Varol 1989 showed that three morphotypes could be distinguished within the A. cymbiformis group based on coccolith size, and rim width. He termed them varieties N, NT and W. Subsequently Burnett (1997) separated these as species - A. confusa. A. cymbiformis and A. maastrichtiensis. respectively. Linnert & Mutterlose (2009), however, concluded that only one, morphologically variable species, was present.
Synonyms: Arkhangelskiella cymbiformis var. NT of Varol 1989.
Discolithus octocentralis Stover (1966) [cf. Reinhardt 1967]

Farinacci & Howe catalog pages: Arkhangelskiella cymbiformis + + * , Arkhangelskiella cymbiformis NT * , Discolithus octocentralis * ,

Distinguishing features: Large sized (>8µm) with a narrow rim (<1.5µm)


Morphology remarks: According to Varol (1989) this form, which he termed A. cymbiformis NT has a thin rim as well as a narrow rim and this reflected in the outer half of the rim being less bright than the rest.

Geological Range:
Notes: Linnert & Mutterlose (2009) show that the mean length of Arkhangellskiella specimens is about 6.5-7µm through the Campanain but 8-9 µm in the Maastrichtian - base on a study of DSDP site 390 (Blake Nose, NW Atlantic).
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 UC13 zone (0% up, 83.2Ma, in Campanian stage). Data source: Burnett 1998 (zonal marker)

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: Arkhangelskiella cymbiformis, synonyms included - Arkhangelskiella cymbiformis; Arkhangelskiella cymbiformis var. NT; space-time plot :: Samples map :: Parent: Arkhangelskiella

    References:

    Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs

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

    Linnert, C. & Mutterlose, J. (2009). Biometry of the Late Cretaceous Arkhangelskiella group: ecophenotypes controlled by nutrient flux. Cretaceous Research. 30: 1193-1204. gs

    Varol, O. (1989d). Quantitative analysis of the Arkhangelskiella cymbiformis group and its biostratigraphical usefulness in the North Sea area. Journal of Micropalaeontology. 8: 131-134. gs

    Vekshina, V. N. (1959). Coccolithophoridae of the Maastrichtian deposits of the West Siberian lowlands. Siberian Science Research Institute of Geology Geophysics Mineralogy and Raw Materials. 2: 56-81. gs

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    Arkhangelskiella cymbiformis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-7-2019

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