The Upper Ordovician arthropod Zonozoe drabowiensis Barrande (Liben and Letna formations, Sandbian, Barrandian area, Czech Republic)

A new find of an isolated prosoma of the possible aglaspidid arthropod Zonozoe drabowiensis from the Revnice Quartzite of the Liben Formation is described. All previously described specimens from the Letna Formation were measured and compared to this specimen, which shows the so far unknown external surface of the exoskeleton and represents the first occurrence outside the Letna Formation.