Helicosphaera sellii


Ancestry: Coccolithophores -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. carteri group -> Helicosphaera sellii
Sister taxa: H. pavimentum, H. hyalina, H. carteri, H. wallichii, H. princei, H. inversa, H. sellii, H. intermedia, H. euphratis, H. granulata, H. ethologa, H. mediterranea,

Short diagnosis: Like H. carteri but pores large. (Late Pliocene- Early Pleistocene)


Taxonomy:

Citation: Helicosphaera sellii (Bukry and Bramlette, 1969) Jafar and Martini, 1975
Rank: Species
Basionym: Helicopontosphaera sellii Bukry and Bramlette, 1969
Variants: H. omanica Sato, Kameo and Takayama, 1991 - bar missing, ? dissolved. Also similar to H. neogranulata (regarded here as a synonym of H. carteri).

Farinacci & Howe catalog pages: Helicopontosphaera sellii * Helicosphaera omanica *

Short diagnosis: Like H. carteri but pores large. (Late Pliocene- Early Pleistocene)

Search data:
TagsLITHS: placolith, asymmetric, RIM: wing, CA: bar-diagonal NE-SW, bar-diagonal,
CSPH: ellipsoidal, varimorphic, V-UNITS: distal shield, R-UNITS: blanket, c-str, px-plate, DETAILS: ca_conjunct, rim-bicyclic, isogyres kinked, isogyres oblique, isogyres separated,
MetricsLith size: 7->12┬Ám;
Sources: lith size from OD but similar to estimates for other Helicosphaera species
The morphological data given here can be used on the advanced search page. See also these notes

See also: Helicosphaera bownii - similar Early-Mid Miocene species;

Geological Range:
Notes: NN12 to 19. Last occurrence has been used in some zonatons but is rather diachronous
Last occurrence (top): within NN19 zone (0.44-1.93Ma, top in Ionian stage). Data source: Young 1998
First occurrence (base): within NN12 zone (5.12-5.59Ma, base in Messinian stage). Data source: Young 1998

Plot of occurrence data:

References:

Bukry, D. & Bramlette, M.N., (1969). Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology, 7: 131-142.

Jafar, S.A. & Martini, E., (1975). On the validity of the calcareous nannoplankton genus Helicosphaera. Senckenbergiana lethaea, 56: 381-397.

Sato, T.; Kameo, K. & Takayama, T., (1991). Coccolith biostratigraphy of the Arabian Sea. Proceedings of the Ocean Drilling Program. Scientific Results, 117: 37-54.

Young, J.R., (1998). Neogene. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265.


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Helicosphaera sellii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-10-2017

Taxon Search:
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AphiaID: 650822 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



Comments (1)

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Mike Styzen (Noble Energy, US)
This species is widely used as a marker in the GOM. Unfortunately I think most workers would not pick it on a specimen resembling the holotype (figures 3and 4 in the original description). Most of us would wait till we saw one with the larger squared-off pores such as illustrated in the specimen illustrated in figures 5 and 6 before making the call.

[The images refered to in this comment are those in the original descrition, see link to Farinacci catalog pages - JRY March 2014]
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