HydrobiusHydrobius is a genus of hydrophilid beetles that contains nine species distributed throughout the Holarctic realm.Hydrobius arcticus Kuwert, 1890Hydrobius convexus Brullé, 1835Hydrobius fuscipes Hydrobius melaenus Hydrobius orientalis Jia & Short, 2009Hydrobius pauper Sharp, 1884Hydrobius pui Jia, 1995Hydrobius punctistriatus Jia, 1995Hydrobius tumidus LeConte, 1835