Helicosphaera magnifica


Classification: Coccolithophores -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. ampliaperta group -> Helicosphaera magnifica
Sister taxa: H. ampliaperta, H. scissura, H. magnifica, H. alata

Taxonomy:

Citation: Helicosphaera magnifica Varol, 1989
Rank: Species
Synonyms:

Distinguishing features: Large to medium sized, with closed central-area and wide wing which extends along most of length of helicolith.

Farinacci & Howe catalog pages: H. magnifica *

Search data:
TagsLITHS: placolith, asymmetric, CA: closed,
CSPH: elongated, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 7->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): in lower part of NN4 zone (40% up, 16.7Ma, in Langhian stage). Data source: Boesiger et al 2017
First occurrence (base): in mid part of NN2 zone (50% up, 20.9Ma, in Aquitanian stage). Data source: Boesiger et al 2017

Plot of occurrence data:

References:

Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E. & Blair, S. A. , . (2017). Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. Journal of Nannoplankton Research. 37(2-3): 145-175. gs V O

Denne, R. A. (2008). Utilizing abundance changes of new and non-standard calcareous nannofossil taxa to increase biostra- tigraphic resolution in expanded continental margin deposits: Examples from the Middle and Lower Miocene of the Gulf of Mexico. Transactions of the Gulf-Coast Association of Geological Societies. 58: 227-239. gs

Varol, O. (1989a). Calcareous nannofossil study of the central and western Solomon Islands. Circum-Pacific Council for Energy and Mineral Resources Earth Sciences. 239-268. gs V O

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O


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Helicosphaera magnifica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-11-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=671 Go to Archive.is to create a permanent copy of this page - citation notes



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