Helicosphaera scissura

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


Citation: Helicosphaera scissura Miller, 1981
Rank: Species

Distinguishing features: Like H. ampliaperta but with a narow slit-like opening in the central-area.

Farinacci & Howe catalog pages: H. scissura *

Morphology: Like H. ampliaperta but more elongate and with slit rather than wide opening in central-area.

Search data:
TagsLITHS: placolith, asymmetric, CA: vacant,
CSPH: elongated, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 9->15µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN5 zone (13.53-14.91Ma, top in Serravallian 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

Miller, P. L. (1981). Tertiary calcareous nannoplankton and benthic foraminifera biostratigraphy of the Point Arena area, California. Micropaleontology. 27(4): 419-443. gs

Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. 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


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

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=684 Go to Archive.is to create a permanent copy of this page - citation notes

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