Neochiastozygus gammation
Set number: 1932
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Neochiastozygus gammation Varol, 2025a
A species of Neochiastozygus characterised by a diagonal crossbar, with arms almost aligned perpendicular to each other, leaving a quadrate field in the middle with a central pore. The distinguishing feature of this species is that the arms of the crossbar form a swastika-like structure.
From the Greek gamma, the third letter of the Greek alphabet, referring to the gamma-shaped cross
Length = 7.05 μm; Width = 4.90 μm (both measured in XPL).
Optical Properties: The narrow outer wall remains in constant extinction, while the inner wall exhibits first-order white interference colours with dextrogyre inclination lines and length-fast (−) elongation on the distal side. The crossbar appears dimmer in this orientation, with its arms exhibiting length-slow (+) elongation.
Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222
Holotype
Neochiastozygus gammation
Varol, 2025a
Late Paleocene
DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau