Helicosphaera walbersdorfensis


Classification: ntax_cenozoic -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. walbersdorfensis group -> Helicosphaera walbersdorfensis
Sister taxa: H. stalis, H. vedderi, H. walbersdorfensis, H. waltrans, H. watkinsii

Taxonomy:

Citation: Helicosphaera walbersdorfensis Muller, 1974
Rank: Species
Synonyms:
Variants:

Distinguishing features: Medium sized. Flange ends in broad wing. Central-area with two normally oblique pores separated by narrow conjunct bar.

Farinacci & Howe catalog pages: H. walbersdorfensis + * , H. muellerae * , H. californiana * , H. minuta *


Size: Medium-sized, 5-8µm. NB In the original description of Muller (1974) the size is quoted 3.5-4.5 µm but the plate magnification indicate that the specimens are significantly larger.

Search data:
TagsLITHS: placolith, asymmetric, CA: ca_conjunct, bar,
CSPH: elongated, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 5->8µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN8 zone (10.55-10.89Ma, top in Tortonian stage). Data source: Boesiger et al 2017
First occurrence (base): within NN4 zone (14.91-17.95Ma, base in Burdigalian 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

Bukry, D. (1981b). Pacific coast coccolith stratigraphy between Point Conception and Cabo Orientes, Deep Sea Drilling Project Leg 63. Initial Reports of the Deep Sea Drilling Project. 63: 445-471. gs V O

Müller, C. (1974c). Nannoplankton aus dem Mittel-Miozän von Walbersdorf (Burgenland). Senckenbergiana Lethaea. 55: 389-405. gs

Müller, C. (1981). Beschreibung neuer Helicosphaera-Arten aus dem Miozän und Revision biostratigraphischer Reichweiten einiger neogener Nannoplankton-Arten. Senckenbergiana Lethaea. 61: 427-435. 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

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 walbersdorfensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=691 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (1)

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Ines Galovic (Croatia)
First occurrence is observed in Paratethian NN4b subzone of Badenian (Andreyeva-Grigorovich et al., 2001), which belongs to Mediterranean MNN4b respectinely (Fornaciari et al, 1996).
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