Ilybius crassus C.G. Thomson, 1856

Sazhnev, A. S., Prokin, A. A., Komarova, A. S. & Philippov, D. A., 2022, New records of aquatic and riparian beetles (Coleoptera) for the fauna of the Vologda Oblast (Russia), Russian Entomological Journal 31 (2), pp. 132-139 : 134

* Ilybius crassus C.G. Thomson, 1856

MATERIAL. Kichmengsko-Gorodetsky distr.: 2.8 km NE of Grigorovo vill., Chiryadka River , 59°49´29´´N 45°34´36´´E, (rocky bottom, depth 0.2–0.5 m, pH=7.7, TDS=95 ppm), 15.VII.2020, 1 ex., DP, AK. Nyuksensky distr .: 3 km E of Levash settlement, Naren’ga River , 60°31´19´´N 44°56´31´´E,ripal (depth 0.1 m, pH=8.2), 16. VI.2020, 1 ex., AK, DP. Sokolsky distr .: 4.5 km NE of Markovskoe vill., Alekseevskoe-1 raised bog, 59°27´11´´N 40°31´05´´E, secondary hollow-pools (pH=4.7, TDS=10 ppm), 11. V.2020, 1 ex., AK, DP. Tarnogsky distr. : Tarnogsky Gorodok rural locality, Kirova str.; 60°30´04´´N 43°34´04´´E, artificial pool in a plastic contain- er (depth 0.3 m) in a backyard, 16. VI.2020, 4 exs., DP, AK ; 2.6 km N of Sergievskaya vill., Bol’shaya Salanga River , 60°16´02´´N 43°55´48´´E, ripal (depth 0.3–0.7 m, current velocity 0.01–0.2 m /s, pH=7.9, sandy-rocky bottom), 17.VII.2020, 1 ex., AK ; 0.5 km W of Pyatovskaya vill., Uloshka River , 60°25´33´´N 43°38´51´´E, ripal (depth 0.1 m, pH=6.3), 18.VII.2020, 1 ex., AK, DP ; 1 km W of Nikolaevskaya vill., 60°29´38´´N 43°31´58´´E, puddle on the road (depth 0.01–0.1 m, sandy bottom), 19.VII.2020, 1 ex., DP, AK ; 1.1 km W of Naumovskaya vill., Pocha River , 60°41´44´´N 43°05´48´´E, in the riverbed (depth 0.1–0.5 m, current velocity 0.01–0.1 m /s, pH=7.8, sandy-rocky bottom with silt), 20.VII.2020, 1 ex., DP, AK. Velikoustyugsky distr .: 4 km SE of Verkhnyaya Toz’ma vill., Bol’shaya Toz’ma River , 60°33´07´´N 45°14´57´´E, ripal (sandy-rocky bottom, pH=7.8), 16.VII.2020, 1 ex., AK, DP. Verkhovazhsky distr .: 5 km SW of Smetanino rural locality, 60°36´41´´N 41°45´32´´E, power line, puddles (clay bottom, depth 0.01–0.1 m), 29.VII.2020, 1 ex., DP .