Correct management of protected areas is one of the key factors in biodiversity conservation. Routine surveys in Mincio Natural Park resulted in the finding of a population of Zeuneriana marmorata (Fieber, 1853), listed as EN (Endangered) by IUCN in the Red List of European Orthoptera. Other known populations were known only for NE Adriatic coast in Italy and inland in Slovenia. We assume that the current presence of this species is what remains of a larger metapopulation living in the wet habitats of the plains around the North Adriatic Sea.Causes of range fragmentation are supposed, current threats outlined and possible conservation actions proposed.