Arkhangelskiellaceae
Classification: ntax_mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae
Sister taxa: Arkhangelskiellaceae, Kamptneriaceae
Distinguishing features: Arkhangelskielids with shields predominantly formed of R-units, thus bright in cross-polarised light; V-units often form dark outer rim.
Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa |
 |  |  |  | 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.
|
|
 |  |  |  | Broinsonia
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.
|
|
 |  |  |  | Thiersteinia
Similar to Broinsonia but with well-developed central spine
|
|
Taxonomy:
Citation: Arkhangelskiellaceae Bukry, 1969 emend Bown & Hampton, 1997 in Bown & Young, 1997Rank: FamilyType species: Type genus:Arkhangelskiella Vekshina, 1959.
Farinacci & Howe catalog pages: Arkhangelskiellaceae [no catalog entry yet]
Distinguishing features: Arkhangelskielids with shields predominantly formed of R-units, thus bright in cross-polarised light; V-units often form dark outer rim.
Morphology: 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.
Search data:
| Tags | LITHS: placolith, |
| Metrics | Lith size: 0->0µm; |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Valanginian Stage (0% up, 139.4Ma, in Valanginian stage). Data source: Total of range of species in this database
Plot of occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Arkhangelskiales
References:
Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs V O
Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs
Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs V O
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. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series. 76-97. 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
