Nannotax3 - ntax_main - Arkhangelskiella specillata

Citation: Arkhangelskiella specillata Vekshina 1959

Taxonomic discussion: The division of Arkhangelskiella into forms with <=5 perforations per quadrant (A cymbiformis) vs >5 perforations per quadrant (A. specillata) is broadly followed by e.g. Perch-Nielsen (1985 figs. 15 & 17). However, the Varol (1989) & Burnett (1997) scheme of using size and rim width is more widely used, on this basis A. specillata is a variant/junior synonym of A. cymbiformis.

Distinguishing features:
Parent taxon (Arkhangelskiella): R-units cover the distal surface, so coccolith appears bright, unicyclic, in LM (although darker towards outer edge); central-area has perforate plate with axial sutures. 4 tiers visible in side view.
This taxon: Like A. cymbiformis but with >5 perforations per quadrant (Verbeek 1977)

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: Verbeek 1977
First occurrence (base): within Campanian Stage (72.17-83.65Ma, base in Campanian stage). Data source: Verbeek 1977

References:

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

Cepek, P. & Hay, W. W. (1969a). Calcareous nannoplankton and biostratigraphic subdivision of the Upper Cretaceous. Transactions of the Gulf-Coast Association of Geological Societies. 19: 323-336. gs

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

Mai, H. (1995). Uncoated, low-voltage SEM analysis of both proximal and distal views of the same coccoliths. Journal of Nannoplankton Research. 17(1): 9-13. gs

Pospichal, J. J. & Wise, S. W. (1990). 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

Salomon, R. (1999). The Calcite Palace. Website - https://ina.tmsoc.org/galleries/CalcitePalace/index.htm. -. gs

Self-Trail, J. (1999). Some new and rarely documented Late Cretaceous calcareous nannofossils from subsurface sediments in South Carolina. Journal of Paleontology. 73(5): 952-963. gs

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

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

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs O

Arkhangelskiella specillata

References:

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