Ilybius 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, 1983) Ilybius hulae (Wewalka, 1984) Ilybius hypomelas (Mannerheim, 1843) Ilybius ignarus (LeConte, 1862) Ilybius incarinatus Zimmermann, 1928 Ilybius jaechi (Fery & Nilsson, 1993) Ilybius jimzim (Larson, 1996) Ilybius lagabrunensis (Schizzerotto & Fery, 1990) Ilybius larsoni (Fery & Nilsson, 1993) Ilybius lateralis (Gebler, 1832) Ilybius lenensis Nilsson, 2000 Ilybius lenkoranensis (Fery & Nilsson, 1993) Ilybius lineellus (LeConte, 1861) Ilybius meridionalis Aubé, 1837 Ilybius montanus (Stephens, 1828) Ilybius nakanei Nilsson, 1994 Ilybius neglectus (Erichson , 1837) Ilybius oblitus Sharp, 1882 Ilybius obtusus Sharp, 1882 Ilybius opacus (Aubé, 1837) Ilybius ovalis Gschwendtner, 1934 Ilybius pederzanii (Fery & Nilsson, 1993) Ilybius picipes (Kirby, 1837) Ilybius pleuriticus LeConte, 1850 Ilybius poppiusi Zaitzev, 1907 Ilybius pseudoneglectus (Franciscolo, 1972) Ilybius quadriguttatus (Lacordaire, 1835) Ilybius quadrimaculatus Aubé, 1838 Ilybius samokovi (Fery & Nilsson, 1993) Ilybius satunini (Zaitzev, 1913) Ilybius similis Thomson, 1856 Ilybius subaeneus Erichson, 1837 Ilybius subtilis (Erichson, 1837) Ilybius thynias Fery & Przewozny, 2011 Ilybius vancouverensis (Leech, 1937) Ilybius vandykei (Leech, 1942) Ilybius verisimilis (Brown, 1932) Ilybius vittiger (Gyllenhal, 1827) Ilybius walsinghami (Crotch, 1873) Ilybius wasastjernae (C.R.Sahlberg, 1824) Ilybius wewalkai (Fery & Nilsson, 1993) 
