Abstract
<jats:p>The study of aquatic biota is of particular interest in view of the considerable anthropogenic impact on freshwater ecosystems in recent decades. Information on regional Trichoptera faunas remains fragmented and scattered in many areas. The present paper provides data from a dataset that includes results of Trichoptera studies conducted since 1981 (primarily during 2018–2025) in 15 regions of European Russia. In total, the dataset contains records from 295 localities. The database includes information on 7759 specimens representing 134 species from 15 families. Eleven Trichoptera species are reported for the first time from the Nizhny Novgorod Region, seven species from the Penza Region, five species each from the Vladimir and Ryazan regions, three species each from the Samara Region, the Republic of Mordovia, and the Volgograd Region, and one species each from the Voronezh, Tambov, and Lipetsk regions, as well as the Chuvash Republic. Hydroptila angulata is recorded for the first time in the Middle Volga Region. The most abundant taxa in the collections belong to the families Limnephilidae, Phryganeidae, and Leptoceridae. Eight species are represented in the dataset by more than 300 specimens each. Hand-held sweep nets were used at 109 localities and yielded 109 species and 3308 specimens. The use of light traps at 45 localities resulted in the collection of 90 species represented by 2651 specimens.</jats:p>