Neochiastozygus alabamaensis
Set number: 1921
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10µm
Holotype, in the mobile mount.
Neochiastozygus alabamaensis Varol, 2025a
A small species of Neochiastozygus characterised by a narrow outer wall, a relatively wide inner wall of similar height, and an axial cross.
Named after the type locality, Alabama, USA
Length = 4.24 μm; Width = 2.98 μm; Height = 1.31 μm (all measured in XPL).
Optical Properties: The outer wall remains in constant extinction, while the inner wall exhibits intense white interference colours and length-fast (−) elongation in the plan view. In this orientation, the inner wall predominates over the outer wall. In the side view, the outer wall displays a whitish-grey interference colour and length-fast (−) elongation, whereas the inner wall, with intense white interference colour, exhibits length-slow (+) elongation.
The axial cross exhibits first-order white interference colours with length-slow (+) elongation.
Neochiastozygus alabamaensis differs from all other species of Neochiastozygus by the presence of an axial cross. In contrast, all other species possess either symmetrical or asymmetrical diagonal crosses.
Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222
Holotype
Neochiastozygus alabamaensis
Varol, 2025a
Moscow Landing, bank of the Tombigbee River, Alabama, USA