Pontosphaera apocresis
Set number: 1917
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1
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2
Fig 1. 10.7 µm, Adana Basin, Late Miocene
Fig 2. 8.3 µm, Malta, Middle Miocene
Discolithus apocresis Kamptner, 1967
A Pontosphaera species is characterised by relatively high walls and a proximal plate with pores arranged in two complete concentric cycles, with randomly arranged pores potentially present in the centre. The distal cover over the proximal plate is low, resulting in distinctly weaker interference colours in the central area compared to the wall in the plan view under XPL.
Kamptner, E. 1967. Kalkflagellaten - Skelettreste aus Tiefseeschlamm des Südatlantischen Ozeans. Annalen des Naturhistorischen Museums in Wien. 71: 117-198.
Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222
Holotype
Pontosphaera apocresis
Kamptner, 1967
Holocene
Station 338 of the Challenger Expedition, South Atlantic Ocean