Helicosphaera wallichii


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

Short diagnosis: Like H. carteri but central-area with inclined pores.


Taxonomy:

Citation: Helicosphaera wallichii (Lohmann 1902) Okada & McIntyre, 1977
Rank: Species
Basionym: Coccolithophora wallichii Lohmann 1902
Synonyms: H. carteri var. wallichii

Farinacci & Howe catalog pages: Coccolithophora wallichi * Helicosphaera carteri wallichii *

Short diagnosis: Like H. carteri but central-area with inclined pores.


Morphology remarks: Slits obliquity: In distal view the slits are rotated about 10-20° clockwise (and so away from the wing), this is the “normal” sense of obliquity in Helicosphaera, as shown by many fossil species. The Pleistocene species H. inversa is similar but shows the opposite sense of obliquity. Obliquity of slits is more consistent in proximal view than in distal view (culture observations).

Evolution & Phylogeny: Separation of H. wallichii from H. carteri at species level was long doubted but has been verified by culture and molecular genetic studies (Geisen et al. 2004).

Biology & life-cycles: Has been cultured occasionally and maintains its coccolith morphology in culture. A combination coccopshere with Helicosphaera HOL ponticuliferus type obsvered by Couapel et al. 2009.

See also: Helicosphaera HOL ;Helicosphaera HOL ponticuliferus type ;

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within NN9 zone (9.53-10.55Ma, base in Tortonian stage). Data source: Young (1998)

Plot of occurrence data:

References:

Couapel, M.J.J.; Beaufort, L. & Young, J.R., (2009). A new Helicosphaera - Syracolithus combination coccosphere (Haptophyta) from the Western Mediterranean sea Journal of Phycology, 45(4): 914-916.

Lohmann, H., (1902). Die Coccolithophoridae, eine Monographie der Coccolithen bildenden Flagellaten, zugleich ein Beitrag zur Kenntnis des Mittelmeerauftriebs. Archiv für Protistenkunde, 1: 89-165.

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


Nannotax3 - Coccolithophores - Helicosphaera wallichii by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-3-2017

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AphiaID: 619112 Nomenclatural data on WoRMS

Comments (2)

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Ines Galovic (Zagreb, Croatia)

The base is in the mid Miocene (Badenian) of Paratethys (Slovenia, Austria, Croatia, Romania...). All the articles you can find if you combined the species name with the Paratethys at the google search.

Best wishes :)

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J Kell (Lincoln Nebraska, US)
Both here and in the black book the base is listed as NN9, but the link in the Neogene menu says NN ?11 and the range chart in the black book has it just into NN10b. I was wondering if anyone has any opinions or personal experience as to what the base of this species is?
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