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The Barbronia weberi (Blanchard, 1897) appeared as a new species in the Hungarian aquatic macroinvertebrate fauna. In 2018, the B. weberi was found on two sampling sites in the River Danube and the stream called Perint. The occurrence location in the Danube is at Paks, while the location in the Perint is near the wastewater treatment plant of Szombathely. To collect the animals we used „kick and sweep” with a standard pond net. According to the results obtained B. weberi has self-sustaining populations in the warmer section of the Danube, which is affected by the cooling water of the power plant. Both direct and indirect vectors form the distribution pattern of the species. On the one hand the Danube is one of the major spreading routes of non-native species in Europe. So B. weberi can spread directly; on the other hand, the sampling points of the Danube and the Perint are almost 200 km away from each other, which suggests the possibility of indirect spreading; i.e. through waterfowls or aquarium trade.

The first occurrence of Barbronia weberi (Blanchard, 1897) (Hirudinea: Arhynchobdellida: Erpobdelliformes: Salifidae) in Hungary