Arkhangelskiella cymbiformis


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

Distinguishing features: Varible sized, with a narrow rim (<1.5µm)


Taxonomy:

Citation: Arkhangelskiella cymbiformis Vekshina, 1959
Rank: Species
Synonyms:
Variants: Varol 1989 suggested that three morphotypes could usefully be distinguished within the A. cymbiformis group based on c rim width (more/less than 2µm) and thickness (some forms have a thin outer edge to the shield). He termed them varieties N, NT and W (for Narrow, Narrow&Thin, Wide rim). Subsequently Burnett (1997) separated these as species - A. confusa. A. cymbiformis and A. maastrichtiensis, with slightly modified definitions. Linnert & Mutterlose (2009), however, concluded that only one, morphologically variable species, was present. In particular they showed that separating the narrow rim width form was of very limited value, even though they studied the time interval during which Varol (1989) recorded it as common. 
Linnert & Mutterlose (2009) also suggested that the maastrichtiana morphotype was simply a wide-rimmed variant of cymbiformis, but they did not include the Late Maastrichtian when this form is recorded as being best developed, so this form may still be worth separating.




Farinacci & Howe catalog pages: A. cymbiformis + + * , A. cymbiformis NT * , D. octocentralis * , A. paucipunctata *

Distinguishing features: Varible sized, with a narrow rim (<1.5µm)

Search data:
TagsLITHS: placolith, elliptical, CA: plate, pores, closed, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 5->12µm;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

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:

References:

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs V O

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 V O

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

Cepek, P. (1978). Mesozoic calcareous nannoplankton of the Eastern North Atlantic, Leg 41. Initial Reports of the Deep Sea Drilling Project. 41: 667-687. gs V 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

Hattner, J. G. & Wise, S. W. (1980). Upper Cretaceous calcareous nannofossil biostratigraphy of South Carolina. South Carolina Geology. 24: 41-117. gs

Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-60. gs V O

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

Mai, H. (2001). New coccolithophorid taxa fom the Guelhemmerberg airshaft. Lower Paleocene, The Netherlands. Micropaleontology. 47: 144-154. gs

Mai, H., von Salis, K., Willems, H. & Romein, A. J. T. (1997a). Fossil coccospheres from the K/T boundary section from Geulhemmerberg, The Netherlands. Micropaleontology. 43(281-302): -. gs

Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs V O

Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs V O

Pospichal, J. J. & Wise, S. W. (1990a). Calcareous nannofossils across the K/T boundary, ODP hole 690C, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 515-532. gs V O

Romein, A. J. T., Willems, H. & Mai, H. (1996). Calcareous nannoplankton of the Geulhemmerberg K/T boundary section, Maastrichtian type area, the Netherlands. Geologie en Mijnbouw. 75: 231-238. gs

Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs

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

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 V O

Vekshina, V. N. (1959). Coccolithophoridae of the Maastrichtian deposits of the West Siberian lowlands. Trudyi Instituta Geologii i Geogiziki, Sibiriskoe Otlodelenie, Akademiya Nauk SSSR (Nauka) Moscow. 2: 56-81. gs


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Arkhangelskiella cymbiformis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-10-2020

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