Nannotax3 - ntax_mesozoic - Miravetesina bergenii

Miravetesina bergenii


Classification: ntax_mesozoic -> Podorhabdales -> Cretarhabdaceae -> Miravetesina -> Miravetesina bergenii
Sister taxa: M. bergenii, M. favula, M. sp.

Distinguishing features:
Parent taxon (Miravetesina): Cretarhabdids with central area spanned by narrow axial cross and fine net.
This taxon: Like M. favula but medium-sized (6-8 µm), with more pronounced axial cross, and younger age. Late Creteceous


Taxonomy:

Citation: Miravetesina bergenii Lees, 2007
Rank: Species

Farinacci & Howe catalog pages: M. bergenii *

Distinguishing features:
Parent taxon (Miravetesina): Cretarhabdids with central area spanned by narrow axial cross and fine net.
This taxon: Like M. favula but medium-sized (6-8 µm), with more pronounced axial cross, and younger age. Late Creteceous


Morphology: "A medium-sized species of Miravetesina with a wide, granulate central area bearing a slightly sigmoidal, delicate, axial cross. Differentiation: Distinguished from M. favula (e.g. see Bown & Cooper, 1998, pl.4.13, fig.17) by its more pronounced and slightly sigmoidal, axial cross, and its much younger age. Remarks: Retecapsa ficula, as illustrated by Burnett (1998a), bears closest resemblance to Stover’s (1966) line-drawing of ficula (pl.9, fig.11), whilst his light-micrographs (including the holotype) show specimens with a narrow central area. Consequently, the form illustrated as M. ficula by Bergen in Bralower & Bergen (1998) is not ficula, but a new species, bergenii." [Lees 2007]

Size: Holotype dimensions: L = 6.82μm, W = 5.28μm.

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, ca_disjunct, grill, CROSS-POLARS: rim-bicyclic, R-prominent,
MetricsLith size: 6->8µm;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

See also: Retecapsa ficula ;

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Lees 2007 (original description)
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Lees 2007 (original description)

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

Bralower, T. J. & Bergen, J. A. (1998). Cenomanian-Santonian calcareous nannofossil biostratigraphy of a transect of cores drilled across the Western Interior Seaway. In, Dean, W. E. & Arthur, M. A. (eds) Stratigraphy and paleoenvironments of the Cretaceous Western Interior Seaway. SEPM Concepts in Sedimentology and Paleontology. -. gs

Lees, J. A. (2007). New and rarely reported calcareous nannofossils from the Late Cretaceous of coastal Tanzania: outcrop samples and Tanzania Drilling Project Sites 5, 9 and 15. Journal of Nannoplankton Research. 29(1): 39-65. gs V O

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs V O


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Miravetesina bergenii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-9-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10686 Go to Archive.is to create a permanent copy of this page - citation notes



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