Nannotax3 - ntax_Farinacci - Pontosphaera lowei Nannotax3 - ntax_Farinacci - Pontosphaera lowei

CATALOG - Pontosphaera lowei


Folder trail: ntax_Farinacci -> P -> Pontosphaera -> Pontosphaera lowei
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Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Current identification:

Compiled data

Citation: Pontosphaera lowei Varol 2025
Taxonomic rank: species
Described on page(s) : 76
Type specimens: Holotype: Pl. 68, Figs. 1-12 [same specimen]
Type sample (& lithostrat): DSDP Leg 23, Site 225, core 22, section 3, 47 cm
Type age (chronostrat): Zanclean, Zone NN12.
Type locality: Red Sea
Type repository: Varol Research office, Rhos on Sea
Repository Country: Wales


Original Description

Diagnosis: This large species of Pontosphaera has a wall that is low in height and a distal cover that mirrors the height of the wall. The proximal plate is pierced by a low number of pores (around 10-12), which are centrally arranged.

Size:
Dimensions of Holotype: Length = 13.48 µm; Width = 9.28 µm (both measured in PC).

Etymology:
In honour of Dr S Lowe, retired biostratigrapher/ palynologist, London, UK, in recognition of his contributions to biostratigraphy.

Extra details from original publication
Optical Properties: This species exhibits first-order white to brown interference colours under polarising light in the plan view. The extinction lines are laevogyre (left-handed) and inclined at an angle of 68° on the distal side. The length-fast (−) elongation indicates how the optical axis behaves when a gypsum plate is inserted in polarised light.

Occurrence: DSDP Leg 23, Sites 225, Red Sea; Manavgat, Turkey

Stratigraphic range: Messinian – Zanclean (Zone NN12)

References:

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


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Pontosphaera lowei: Catalog entry compiled by Jeremy Young. Viewed: 14-3-2026

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=55836 Go to Archive.is to create a permanent copy of this page - citation notes

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