sooty mud dweller

Ilybius is a large genus of predatory aquatic beetles in the family Dytiscidae. The genus is native to the Palearctic (including Europe), the Near East, the Nearctic, and North Africa. 70 species has been described from this genus:

Ilybius aenescens Thomson, 1870
Ilybius albarracinensis (Fery, 1986)
Ilybius angustior (Gyllenhal, 1808)
Ilybius anjarum Nilsson, 1999
Ilybius apicalis Sharp, 1873
Ilybius ater (De Geer, 1774)
Ilybius austrodiscors (Larson, 1996)
Ilybius balkei (Fery & Nilsson, 1993)
Ilybius bedeli (Zaitzev, 1908)
Ilybius biguttulus (Germar, 1824)
Ilybius boryslavicus Lomnicki, 1894
Ilybius chalconatus (Panzer, 1796)
Ilybius chishimanus Kôno, 1944
Ilybius churchillensis Wallis, 1939
Ilybius cinctus Sharp, 1878
Ilybius confertus (LeConte, 1861)
Ilybius confusus Aubé, 1838
Ilybius crassus Thomson, 1856
Ilybius dettneri (Fery, 1986)
Ilybius discedens Sharp, 1882
Ilybius discors (LeConte, 1861)
Ilybius erichsoni (Gemminger & Harold, 1868)
Ilybius euryomus (Larson, 1996)
Ilybius fenestratus (Fabricius, 1781)
Ilybius fraterculus LeConte, 1862
Ilybius fuliginosus (Fabricius, 1792)
Ilybius gagates (Aubé, 1838)
Ilybius guttiger (Gyllenhal, 1808)
Ilybius hozgargantae (Burmeister,...