Pontosphaera lowei
Set number: 1545
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10µm
Pontosphaera lowei Varol, 2025a
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 arranged centrally.
In honour of Dr S Lowe, retired biostratigrapher/palynologist, London, UK, in recognition of his contributions to biostratigraphy.
Length = 13.48 μm; Width = 9.28 μm (both measured in PC).
Optical Properties: This species exhibits first-order white to brown interference colours under polarised 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.