Nannotax3 - Mesozoic

Russellia

Classification: Mesozoic -> Holococcoliths -> Rarer genera -> Russellia
Sister taxa: Bifidalithus, Bilapillus, Multipartis, Munarinus, Octolithus, Okkolithus, Ottavianus, Pharus, Ramsaya, Russellia, Saepiovirgata, Acuturris, Anfractus, Duocameratus, Lacunolithus-Bown, Metadoga, Nicholasia, Paulpearsonia, Petrobrasiella, Pseudoconus, Semihololithus, Stereorhabdus, Tanzanella, Thecatus, unidentified holococcoliths,

Distinguishing features: Holococcoliths with rim of 10-26 blocks and a small central block.

Daughter taxa: (blue => in age window 0-800Ma)
				Russellia bukryi medium sized (5-8 µm)
				Russellia laswellii small sized (3-5 µm)
				Russellia sp. Specimens not identified to species level

Taxonomy:

Citation: Russellia Risatti, 1973

Rank: Genus

Type species: Russellia bukryi Risatti, 1973

Farinacci & Howe catalog pages: Russellia *

Distinguishing features: Holococcoliths with rim of 10-26 blocks and a small central block.

Search data:

Tags	LITHS: holococcolith, elliptical, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic,
Metrics	Lith size: 3->8µm; Sources: size range of included species

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 Maastrichtian Stage (0% up, 72.1Ma, in Maastrichtian 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. See also: customisable plot Parent: Rarer genera

References:

Risatti, J. B. (1973). Nannoplankton biostratigraphy of the Upper Bluffport Marl-Lower Prairie Bluff Chalk interval (upper Cretaceous) in Mississippi. In, Smith, L. A. & Hardenbol, J. (eds) Proceedings of the Symposium on Calcareous Nannofossils. Gulf Coast Section SEPM Publication, 8-57. gs

Russellia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-4-2020

Taxon Search:

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11061 Go to Archive.is to create a permanent copy of this page - citation notes

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