Neochiastozygus dyomisa
Set number: 1928
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Holotype
Set number: 1931
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Set number: 1930
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10µm
Set number: 1929
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1
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3
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10µm
Neochiastozygus dyomisa Varol, 2025a
A species of Neochiastozygus characterised by an asymmetrical diagonal crossbar, with a straight short arm aligned in the NW-SE direction and a sigmoid (slightly dislocated) longer arm aligned in the NE-SW direction on the distal view. The distinguishing feature of this species is that the arms of the crossbar consist of two halves.
From the Greek dyo misa, two “helves” refer to the arms of the central cross, consisting of two halves.
Length = 6.58 μm; Width = 4.50 μm (both measured in XPL).
Optical Properties: The narrow outer wall remains in constant extinction, while the inner wall exhibits first-order intense white interference colours with dextrogyre inclination lines and length-fast (−) elongation in the plan view. The crossbar appears dimer in this orientation, with its arms exhibiting length-fast (-) elongation.
Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222
Holotype
Neochiastozygus dyomisa
Varol, 2025a
Late Paleocene
DSDP Leg 25, Site 245, Mozambique Channel (Davie Ridge), Indian Ocean