Hygrotus is a genus of beetle in family Dytiscidae. It contains two subgenera (Coelambus and Hygrotus) and about 70 species, including:
- Hygrotus acaroides <small>(LeConte, 1855)</small>
- Hygrotus aequalis <small>Falkenström, 1932</small>
- Hygrotus ahmeti <small>Hájek, Fery & Erman, 2005</small>
- Hygrotus armeniacus <small>(Zaitzev, 1927)</small>
- Hygrotus artus <small>(Fall, 1919)</small>
- Hygrotus berneri <small>Young & Wolfe, 1984</small>
- Hygrotus bruesi <small>(Fall, 1928)</small>
- Hygrotus caspius <small>(Wehncke, 1875)</small>
- Hygrotus chinensis <small>(Sharp, 1882)</small>
- Hygrotus collatus <small>(Fall, 1919)</small>
- Hygrotus compar <small>(Fall, 1919)</small>
- Hygrotus confluens <small>(Fabricius, 1787)</small>
- Hygrotus corpulentus <small>(Schaum, 1864)</small>
- Hygrotus cribrarius <small>(Scudder, 1900)</small>
- Hygrotus curvilobus <small>Fery, Sadeghi & Hosseinie, 2005</small>
- Hygrotus curvipes <small>(Leech, 1938)</small>
- Hygrotus decoratus <small>(Gyllenhal, 1810)</small>
- Hygrotus derelictus <small>(Scudder, 1900)</small>
- Hygrotus disjectus <small>(Scudder, 1900)</small>
- Hygrotus dissimilis <small>(Gemminger & Harold, 1868)</small>
- Hygrotus diversipes <small>Leech, 1966</small>
- Hygrotus dzieduszyckii <small>(Lomnicki, 1894)</small>
- Hygrotus enneagrammus <small>(Ahrens, 1833)</small>
- Hygrotus falli <small>(Wallis, 1924)</small>
- Hygrotus farctus <small>(LeConte, 1855)</small>
- Hygrotus femoratus <small>(Fall, 1901)</small>
- Hygrotus flaviventris <small>(Motschulsky, 1860)</small>
- Hygrotus fontinalis <small>Leech, 1966</small>
- Hygrotus fraternus <small>(LeConte, 1852)</small>
- Hygrotus fresnedai <small>(Fery, 1992)</small>
- Hygrotus fumatus <small>(Sharp, 1882)</small>
- Hygrotus ganglbaueri <small>(Lomnicki, 1894)</small>
- Hygrotus hydropicus <small>(LeConte, 1852)</small>
- Hygrotus impressopunctatus <small>(Schaller, 1783)</small>
- Hygrotus inaequalis <small>(Fabricius, 1777)</small>
- Hygrotus infernalis <small>(Scudder, 1900)</small>
- Hygrotus infuscatus <small>(Sharp, 1882)</small>
- Hygrotus inscriptus <small>(Sharp, 1882)</small>
- Hygrotus intermedius <small>(Fall, 1919)</small>
- Hygrotus laccophilinus <small>(LeConte, 1878)</small>
- Hygrotus lagari <small>(Fery, 1992)</small>
- Hygrotus latefasciatus <small>(Lomnicki, 1894)</small>
- Hygrotus lernaeus <small>(Schaum, 1857)</small>
- Hygrotus lutescens <small>(LeConte, 1852)</small>
- Hygrotus marginipennis <small>(Blatchley, 1912)</small>
- Hygrotus marklini <small>(Gyllenhal, 1813)</small>
- Hygrotus masculinus <small>(Crotch, 1874)</small>
- Hygrotus miocenus <small>(Wickham, 1912)</small>
- Hygrotus niedzwiedzkii <small>(Lomnicki, 1894)</small>
- Hygrotus nigrescens <small>(Fall, 1919)</small>
- Hygrotus nigrolineatus <small>(Steven, 1808)</small>
- Hygrotus novemlineatus <small>(Stephens, 1829)</small>
- Hygrotus nubilus <small>(LeConte, 1855)</small>
- Hygrotus obscureplagiatus <small>(Fall, 1919)</small>
- Hygrotus orthogrammus <small>(Sharp, 1882)</small>
- Hygrotus ozokeriticus <small>(Lomnicki, 1894)</small>
- Hygrotus pallidulus <small>(Aubé, 1850)</small>
- Hygrotus parallellogrammus <small>(Ahrens, 1812)</small>
- Hygrotus patruelis <small>(LeConte, 1855)</small>
- Hygrotus pectoralis <small>(Motschulsky, 1860)</small>
- Hygrotus pedalis <small>(Fall, 1901)</small>
- Hygrotus picatus <small>(Kirby, 1837)</small>
- Hygrotus picipoides <small>(Lomnicki, 1894)</small>
- Hygrotus polonicus <small>(Aubé, 1842)</small>
- Hygrotus punctilineatus <small>(Fall, 1919)</small>
- Hygrotus quinquelineatus <small>(Zetterstedt, 1828)</small>
- Hygrotus saginatus <small>(Schaum, 1857)</small>
- Hygrotus salinarius <small>(Wallis, 1924)</small>
- Hygrotus sanfilippoi <small>(Fery, 1992)</small>
- Hygrotus sayi <small>J.Balfour-Browne, 1944</small>
- Hygrotus sellatus <small>(LeConte, 1866)</small>
- Hygrotus semenowi <small>(Jakovlev, 1899)</small>
- Hygrotus semivittatus <small>(Fall, 1919)</small>
- Hygrotus stefanschoedli <small>Fery, Sadeghi & Hosseinie, 2005</small>
- Hygrotus suturalis <small>(LeConte, 1850)</small>
- Hygrotus sylvanus <small>(Fall, 1917)</small>
- Hygrotus thermarum <small>(Darlington, 1928)</small>
- Hygrotus tumidiventris <small>(Fall, 1919)</small>
- Hygrotus turbidus <small>(LeConte, 1855)</small>
- Hygrotus unguicularis <small>(Crotch, 1874)</small>
- Hygrotus urgensis <small>(Jakovlev, 1899)</small>
- Hygrotus versicolor <small>(Schaller, 1783)</small>
- Hygrotus wardii <small>(Clark, 1862)</small>
- Hygrotus zigetangco <small>Fery, 2003</small>
References