Arkhangelskiellaceae


Ancestry: Mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae
Sister taxa: Arkhangelskiellaceae, Kamptneriaceae,

Short diagnosis: Arkhangelskielids with shields predominantly formed of R-units, thus bright in cross-polarised light; V-units often form dark outer rim.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
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.

Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.

Similar to Broinsonia but with well-developed central spine

Taxonomy:

Citation: Arkhangelskiellaceae Bukry, 1969 emend Bown & Hampton, 1997 in Bown & Young, 1997
Rank: Family
Type species: Type genus:Arkhangelskiella Vekshina, 1959.

Farinacci & Howe catalog pages: Arkhangelskiellaceae [no catalog entry yet]

Short diagnosis: Arkhangelskielids with shields predominantly formed of R-units, thus bright in cross-polarised light; V-units often form dark outer rim.


Morphology remarks: Tiered placolith coccoliths with central-areas spanned by axial crosses and grills, or filled by a perforate plate divided by axial sutures. The shields are typically bright in cross polarised light (rim dominated by R-unit) but bicyclic images are also observed.
Moshkovitz & Osmond (1989) analyse the birefringence pattern in detail.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R. & Young, J.R., (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, 19(1): 21-36.

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

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

Moshkovitz, S. & Osmond, K., (1989). The optical properties and microcrystallography of Arkhangelskiellaceae and some other calcareous nannofossils of the Late Cretaceous. In: Crux, J.A. and Heck, S.E.v. (Editors), Nannofossils and their aplications: Proceedings INA Conference.London 1987. Ellis Horwood, Chichester, pp. 76-97.

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.


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Arkhangelskiellaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-9-2017

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