Helicosphaera alata

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


Citation: Helicosphaera alatade Kaenel & Boesiger in Boesiger et al. 2017
Rank: species

Distinguishing features: Like H. magnifica but with open central area, and larger

Farinacci & Howe catalog pages: H. alata *

Size: "large to very large" - probably 8-14 µm

Search data:
MetricsLith size: 8->14µm;
Data source notes: Boesiger et al 2017
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 (30% up, 17Ma, in Langhian stage). Data source: Boesiger et al 2017
First occurrence (base): in upper part of NN2 zone (70% up, 20.1Ma, in Aquitanian stage). Data source: Boesiger et al 2017

Plot of occurrence data:


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


Helicosphaera alata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-6-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1630 Go to Archive.is to create a permanent copy of this page - citation notes

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