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Keywords from Image Description:
PZSLPlate. Thelodus sp Thelodontidae sp Thelodus sp Thelodontidae sp Psammosteus paradoxus Ag Agassiz Ag Agassiz Ag Agassiz en Scales of fossil agnathans and lobefinned fishbr Outer view of head scales enlarged Outer view of tail scales enlarged Plate fragment enlarged Vertical section through plate enlarged Vertical section