Abstract
The caddislfies fauna is poorly known in the karstic area which covers about 50% of the entire territory of the Republic of Croatia. The Krka River is a karstic Mediterranean river with specific travertine barriers and 2 lakes. The spring of the Krka River is located 45 kilometres from the coast. The river flows into the Adriatic Sea near the city of Šibenik. In 1998 and 1999, systematic collecting of Trichoptera was performed in that area, and in 2000, 2005, 2007 and 2009 caddisflies were collected periodically. Sampling was performed at 9 locations representing different types of habitats: springs, travertine barriers, upper, middle and lower parts of the Krka River and lakes. During 16 on–site visits, 4792 adults were collected, belonging to 50 species. Diversity, distribution, ecology and biogeography of this material were analyzed.