Helicosphaerella philippinensis

(Müller, 1980a) Varol, 2025 Feb 23, 2021

Set number: 1667

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10µm

ODP Leg 154, Site 925C, Ceara Rise, Equatorial Atlantic Ocean

In the mobile mount

Set number: 1373

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10µm

Helicosphaerella philippinensis, Middle Miocene, Antakya, Hatay, Turkey

Set number: 1374

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10µm

Helicosphaerella philippinensis, Middle Miocene, Antakya, Hatay, Turkey

Set number: 1375

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10µm

Helicosphaerella philippinensis, Middle Miocene, Antakya, Hatay, Turkey

Set number: 1377

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10µm

Helicosphaerella philippinensis, Middle Miocene, Antakya, Hatay, Turkey

Set number: 1376

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10µm

Helicosphaerella philippinensis, Middle Miocene, Antakya, Hatay, Turkey

Set number: 1378

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10µm

Helicosphaerella philippinensis, Middle Miocene, Antakya, Hatay, Turkey

Final Epithet

Helicosphaerella philippinensis (Müller, 1980a) Varol, 2025

Basionym

Helicosphaera philippinensis Müller, 1980

Remarks

A small, sub-quadrate helicolith characterised by an asymmetrical Type II blanket (Helicosphaerella recta type), a truncated flange termination, and a central opening spanned by an inverse conjunct bar.

Helicosphaerella philippinensis is distinguished from Helicosphaerella orientalis by the presence of an inverse conjunct bar in the central area, whereas the latter has a fully closed central area.

References

Aubry, M. -P. & Bord, D. 2009. Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary. In: Koeberl, C., Montanari, A. (eds), The Late Eocene Earth-Hothouse, Icehouse, and Impacts. Geological Society of America, Special Papers 452: 279-301.

Black, M. 1971c. The systematics of coccoliths in relation to the paleontological record. In: Funnell, B. M. & Riedel, W. R. (Eds), The Micropaleontology of the Oceans. Cambridge University Press, Cambridge. 611-624.

Bramlette, M. N. & Wilcoxon, J. A. 1967. Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology 5: 93-131.

Haq, B. U. 1971. Paleogene calcareous nannoflora. Parts I-IV. Stockholm Contributions in Geology 25: 1-158.

Jafar, S. A., Martini, E., 1975, On the validity of the calcareous nannoplankton genus Helicosphaera. Senckenbergiana Lethaea 56, 381-397.

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

Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222

Taxonomy

Helicosphaerella

Biostratigraphy

Stratigraphic Range

Langhian - Tortonian

Age (Ma)

14.00 - 7.78

Holotype

Helicosphaera philippinensis Muller, 1980

Middle Miocene

Cebu, Philippines