Nematoptychius is an extinct genus of ray-finned fish that lived from the Visean age of the Mississippian epoch (Early Carboniferous) to the Bashkirian age of the Pennsylvanian epoch (Late Carboniferous) in what is now Scotland, Belgium and France.
Its type species, Nematoptychius greenocki, was first described as Pygopterus greenocki by Ramsay Traquair.
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