First Record of Hydroptila ivisa Malicky, 1972 (Trichoptera: Hydroptilidae) from Slovakia, with Additional Data on Caddisflies from Two Western Carpathian Streams

Abstract

We report the first record of Hydroptila ivisa Malicky, 1972 in Slovakia. The faunistic survey of caddisflies was conducted on the eastern slopes of the Veľká Fatra Mountains in the village of Blatnica (Turiec River Basin, central Slovakia) in 2024. One male and two females of Hydroptila ivisa were attracted by UV light traps at the Blatnický potok stream. In 2025, the presence of the species was confirmed at the same locality with the capture of two additional females. Furthermore, one male and one female were recorded upstream in the Gaderský potok stream, the main tributary of the Blatnický potok stream, located within the Veľká Fatra National Park. This is only the third known location of the species in the Carpathians; consistent with its already known habitat preferences, it was found in the rhithral. We also present a list of caddisfly species recorded during the survey, which expands the known species diversity of the region.