Nannotax3 - ntax_mesozoic - Arkhangelskiella specillata

Arkhangelskiella specillata


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

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)


Taxonomy:

Citation: Arkhangelskiella specillata Vekshina, 1959
Rank: Species
Variants:
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.

Farinacci & Howe catalog pages: A. specillata * , A. specillata ethmopora *

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)

Search data:
TagsLITHS: placolith, elliptical, CA: plate, pores, closed, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 8->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:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Verbeek 1977
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian stage). Data source: Verbeek 1977

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

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 V O

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

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

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 V 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 V O


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Arkhangelskiella specillata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-1-2022

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