Zygodiscus selahattinkanlii

Zygodiscus selahattinkanlii Varol, 2025a

This species has a narrow, dextrally imbricated outer wall, a relatively wide tangential inner wall, and a multi-segmented, diagonal disjunct bar that completely closes the narrow central area. Zygodiscus selahattinkanlii may represent an intermediate form between Zygodiscus segmentatus and Zygodiscus sheldoniae.

In honour of my late friend, Selahhaddin Kanli, of North Wales, U.K., whose contributions and friendship are deeply cherished.

Length = 9.36 μm; Width = 5.96 μm (both measured in XPL).

Optical Properties: The outer wall remains in constant extinction, while the inner wall exhibits first-order white to yellow interference colours, with dextrogyre inclined extinction lines and length-fast (−) elongation on the distal side. The diagonal bar displays first-order white interference colours with length-slow (+) elongation in the plan view.

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