First record of Berosus geminus (Reiche et Saulcy, 1856) and Enochrus affinis (Thunberg, 1794) (Coleoptera: Hydrophilidae) for Croatian fauna

Research on aquatic beetle fauna was conducted in the aquatic habitats of Kopački rit Nature Park during the year 2005. One species of water scavenger beetle (Coleoptera, Hydrophilidae) Berosus geminus Reiche et Saulcy, which had not been recorded in Croatia before, was found during this inventory research. Although endangered in Europe, the species Berosus geminus has an optimal habitat in Kopački rit, as has been proven by the collection of 17 specimens. Enochrus affinis Thunberg, was also found during the study, representing the first documented occurrence in Croatia. Both species were found in the unique flooded areas of Kopački rit. Some morphological, biological and distributional features of these two species are discussed