List of Hydraena species

This is a list of 924 species in Hydraena, a genus of minute moss beetles in the family Hydraenidae.

Hydraena species

 * Hydraena abbasigili Jäch, 1988 i c g
 * Hydraena abdita Orchymont, 1948 i c g
 * Hydraena abyssinica Régimbart, 1905 i c g
 * Hydraena accurata Orchymont, 1948 i c g
 * Hydraena achaica Jäch, 1995 i c g
 * Hydraena acumena Perkins, 2011 i c g
 * Hydraena adelbertensis Perkins, 2011 i c g
 * Hydraena adrastea Orchymont, 1948 i c g
 * Hydraena aethaliensis Breit, 1917 i c g
 * Hydraena affirmata Perkins, 2007 i c g
 * Hydraena affusa Orchymont, 1936 i c g
 * Hydraena africana Kuwert, 1888 i c g
 * Hydraena akameku Perkins, 2011 i c g
 * Hydraena akbesiana Audisio, De Biase and Jäch, 1993 i c g
 * Hydraena albai Sáinz-Cantero, 1993 i c g
 * Hydraena alberti Balfour-Browne, 1950 i c g
 * Hydraena alcantarana Ienistea, 1985 i c g
 * Hydraena algerina Kaddouri, 1992 i c g
 * Hydraena alia Orchymont, 1934 i c g
 * Hydraena aliciae Jäch and Díaz, 2005 i c g
 * Hydraena allomorpha Lagar and Fresneda, 1990 i c g
 * Hydraena alluaudi Régimbart, 1906 i c g
 * Hydraena alpicola Pretner, 1931 i c g
 * Hydraena altamirensis Díaz Pazos and Garrido Gonzalez, 1993 i c g
 * Hydraena altapapua Perkins, 2011 i c g
 * Hydraena alternata Perkins, 1980 i c g
 * Hydraena alterra Perkins, 1980 i c g
 * Hydraena alticola Skale and Jäch, 2008 i c g
 * Hydraena altiphila Perkins, 2011 i c g
 * Hydraena amazonica Perkins, 2011 i c g
 * Hydraena ambiflagellata Zwick, 1977 i c g
 * Hydraena ambigua Ganglbauer, 1901 i c g
 * Hydraena ambiosina Perkins, 2007 i c g
 * Hydraena ambra Perkins, 2011 i c g
 * Hydraena ambripes Perkins, 2011 i c g
 * Hydraena ambroides Perkins, 2011 i c g
 * Hydraena americana Jäch, 1993 i c g
 * Hydraena amidensis Jäch, 1988 i c g
 * Hydraena ampla Perkins, 2011 i c g
 * Hydraena anaphora Perkins, 1980 i c g
 * Hydraena anatolica Janssens, 1963 i c
 * Hydraena ancylis Perkins, 1980 i c g
 * Hydraena ancyrae Jäch, 1992 i c g
 * Hydraena andalusa Lagar and Fresneda, 1990 i c g
 * Hydraena andreinii Orchymont, 1934 i c g
 * Hydraena angulicollis Notman, 1921 i c g b
 * Hydraena angulosa Mulsant, 1844 i c g
 * Hydraena angustata Sturm, 1836 i c g
 * Hydraena anisonycha Perkins, 1980 i c g
 * Hydraena antaria Perkins, 2007 i c g
 * Hydraena antiatlantica Jäch, Aguilera and Hernando, 1998 i c g
 * Hydraena antiochena Jäch, 1988 i c g
 * Hydraena apertista Perkins, 2011 i c g
 * Hydraena apexa Perkins, 2011 i c g
 * Hydraena appalachicola Perkins, 1980 i c g
 * Hydraena appetita Perkins, 2007 i c g
 * Hydraena aquila Perkins, 2011 i c g
 * Hydraena arabica Balfour-Browne, 1951 i c g
 * Hydraena arachthi Ferro and Jäch, 2000 i c g
 * Hydraena arcta Perkins, 2007 i c g
 * Hydraena arenicola Perkins, 1980 i c g
 * Hydraena argutipes Perkins, 1980 i c g
 * Hydraena ariana Janssens, 1962 i c g
 * Hydraena arizonica Perkins, 1980 i c g
 * Hydraena armata Reitter, 1880 i c g
 * Hydraena armatura Perkins, 2014 i c g
 * Hydraena armeniaca Janssens, 1968 i c g
 * Hydraena armipalpis Jäch and Díaz, 2000 i c g
 * Hydraena armipes Rey, 1886 i c g
 * Hydraena aroensis (Ferro, 1991) i c g
 * Hydraena arunensis Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena ascensa Perkins, 2007 i c g
 * Hydraena assimilis Rey, 1885 i c g
 * Hydraena ateneo Freitag, 2013 i c g
 * Hydraena athertonica Perkins, 2007 i c g
 * Hydraena atrata Desbrochers des Loges, 1891 i c g
 * Hydraena atroscintilla Perkins, 2011 i c g
 * Hydraena attaleiae Ferro, 1984 i c g
 * Hydraena audisioi Jäch, 1992 i c g
 * Hydraena aulaarta Perkins, 2011 i c g
 * Hydraena aurita Jäch, 1988 i c g
 * Hydraena australica Zwick, 1977 i c g
 * Hydraena australula Perkins, 2007 i c g
 * Hydraena austrobesa Perkins, 2011 i c g
 * Hydraena avuncula Jäch, 1988 i c g
 * Hydraena bacchusi Perkins, 2011 i c g
 * Hydraena bactriana Janssens, 1962 i c g
 * Hydraena bakriensis Skale and Jäch, 2011 i c g
 * Hydraena balearica Orchymont, 1930 i c g
 * Hydraena balfourbrownei Bameul, 1986 i c g
 * Hydraena balkei Perkins, 2011 i c g
 * Hydraena balli Orchymont, 1940 i c g
 * Hydraena barbipes Zwick, 1977 i c g
 * Hydraena barricula Perkins, 1980 i c g
 * Hydraena barrosi Orchymont, 1934 i c g
 * Hydraena bedeli Berthélemy, 1992 i c g
 * Hydraena belgica Orchymont, 1930 i c g
 * Hydraena beniensis Perkins, 2011 i c g
 * Hydraena benjaminus Jäch and Díaz, 2006 i c g
 * Hydraena bensae Ganglbauer, 1901 i c g
 * Hydraena bergeri (Janssens, 1972) i c g
 * Hydraena berthelemyana Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006 i c g
 * Hydraena berytus Jäch, 1986 i c g
 * Hydraena beyarslani Jäch, 1988 i c g
 * Hydraena bicarina Perkins, 2014 i c g
 * Hydraena bicarinova Perkins, 2011 i c g
 * Hydraena bicolorata Jäch, 1997 i c g
 * Hydraena bicuspidata Ganglbauer, 1901 i c g
 * Hydraena bidefensa Perkins, 2007 i c g
 * Hydraena bifunda Perkins, 2011 i c g
 * Hydraena bihamata Champion, 1920 i c g
 * Hydraena biimpressa Perkins, 2007 i c g
 * Hydraena billi Zwick, 1977 i c g
 * Hydraena bilobata Jäch and Díaz, 1998 i c g
 * Hydraena biltoni Jäch and Díaz, 2012 i c g
 * Hydraena bimagua Jäch, 1986 i c g
 * Hydraena birendra Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena biseptosa Perkins, 2014 i c g
 * Hydraena bispinosa Pu, 1951 i c g
 * Hydraena bisulcata Rey, 1884 i c g
 * Hydraena bitruncata Orchymont, 1934 i c g
 * Hydraena bituberculata Perkins, 1980 i c g
 * Hydraena biundulata Perkins, 2011 i c g
 * Hydraena blackburni Zaitzev, 1908 i c g
 * Hydraena bodemeyeri Jäch and Díaz, 2001 i c g
 * Hydraena boetcheri Orchymont, 1932 i c g
 * Hydraena bolivari Orchymont, 1936 i c g
 * Hydraena boliviana Perkins, 2011 i c g
 * Hydraena bononiensis Binaghi, 1960 i c g
 * Hydraena borbonica Fairmaire, 1898 i c g
 * Hydraena bosnica Apfelbeck, 1909 i c g
 * Hydraena brachymera Orchymont, 1936 i c g
 * Hydraena bractea Perkins, 1980 i c g
 * Hydraena bractoides Perkins, 1980 i c g
 * Hydraena brahmin Perkins, 2011 i c g
 * Hydraena breedlovei Perkins, 1980 i c g
 * Hydraena brevis Sharp, 1882 i c g
 * Hydraena britteni Joy, 1907 i c g
 * Hydraena brittoni Zwick, 1977 i c g
 * Hydraena bromleyae Jäch, 1986 i c g
 * Hydraena browni Perkins, 1980 i c g
 * Hydraena bubulla Perkins, 2011 i c g
 * Hydraena bulgarica Breit, 1916 i c g
 * Hydraena buloba Perkins, 2011 i c g
 * Hydraena buquintana Perkins, 2011 i c g
 * Hydraena buschietanni Freitag, 2021 i c g
 * Hydraena buscintilla Perkins, 2011 i c g
 * Hydraena busuanga Freitag and Jäch, 2007 i c g
 * Hydraena calcarifera Janssens, 1959 i c g
 * Hydraena californica Perkins, 1980 i c g
 * Hydraena campbelli Perkins, 1980 i c g
 * Hydraena canakcioglui Janssens, 1965 i c g
 * Hydraena canticacollis Perkins, 1980 i c g
 * Hydraena capacis Perkins, 2007 i c g
 * Hydraena capensis Perkins, 2014 i c g
 * Hydraena capetribensis Perkins, 2007 i c g
 * Hydraena cappadocica Jäch, 1988 i c g
 * Hydraena caprivica Perkins, 2014 i c g
 * Hydraena capta Orchymont, 1936 i c g
 * Hydraena carbonaria Kiesenwetter, 1849 i c g
 * Hydraena carica Jäch, 1988 i c g
 * Hydraena carinocisiva Perkins, 2011 i c g
 * Hydraena carinulata Rey, 1886 i c g
 * Hydraena carmellita Perkins, 2011 i c g
 * Hydraena carniolica Pretner, 1970 i c g
 * Hydraena castanea Deane, 1937 i c g
 * Hydraena castanescens Freitag and Jäch, 2007 i c g
 * Hydraena cata Orchymont, 1936 i c g
 * Hydraena catalonica Fresneda, Aguilera and Hernando, 1994 i c g
 * Hydraena catherinae Bameul and Jäch, 2001 i c g
 * Hydraena caucasica Kuwert, 1888 i c g
 * Hydraena cavifrons Perkins, 2011 i c g
 * Hydraena cephalleniaca Jäch, 1985 i c g
 * Hydraena cervisophila Jäch, 1992 i c g
 * Hydraena challeti Perkins, 2011 i c g
 * Hydraena cheesmanae Perkins, 2011 i c g
 * Hydraena chenae Pu, 1951 i c g
 * Hydraena chersonesica Jäch, Díaz and Przewozny, 2007 i c g
 * Hydraena cherylbarrae Perkins, 2011 i c g
 * Hydraena chiapa Perkins, 1980 i c g
 * Hydraena chiesai Janssens, 1965 i c g
 * Hydraena chifengi Jäch and Díaz, 1999 i c g
 * Hydraena chobauti Guillebeau, 1896 i c g
 * Hydraena christinae Audisio, De Biase and Jäch, 1996 i c g
 * Hydraena christoferi Jäch and Díaz, 2005 i c g
 * Hydraena ciliciensis Jäch, 1988 i c g
 * Hydraena circulata Perkins, 1980 i c g b
 * Hydraena cirrata Champion, 1920 i c g
 * Hydraena clarinis Perkins, 2011 i c g
 * Hydraena claudia Freitag and Jäch, 2007 i c g
 * Hydraena clavicula Perkins, 2014 i c g
 * Hydraena clavigera Zwick, 1977 i c g
 * Hydraena clemens Jäch and Díaz, 2006 i c g
 * Hydraena clinodorsa Perkins, 2011 i c g
 * Hydraena clystera Perkins, 2011 i c g
 * Hydraena cochabamba Perkins, 2011 i c g
 * Hydraena colchica Janssens, 1963 i c g
 * Hydraena colombiana Perkins, 1980 i c g
 * Hydraena colorata Perkins, 2011 i c g
 * Hydraena colymba Perkins, 1980 i c g
 * Hydraena compressipilis Jäch and Díaz, 1998 i c g
 * Hydraena concepcionica Perkins, 2011 i c g
 * Hydraena concinna Orchymont, 1932 i c g
 * Hydraena confluenta Perkins, 2011 i c g
 * Hydraena confusa Pu, 1951 i c g
 * Hydraena connexa Orchymont, 1932 i c g
 * Hydraena converga Perkins, 2007 i c g
 * Hydraena coomani Orchymont, 1932 i c g
 * Hydraena cooperi Balfour-Browne, 1954 i c g
 * Hydraena cooperoides Perkins, 2014 i c g
 * Hydraena copulata Perkins, 2011 i c g
 * Hydraena cordata Schaufuss, 1883 i c g
 * Hydraena cordiformis Jäch and Díaz, 2000 i c g
 * Hydraena cordispina Perkins, 2011 i c g
 * Hydraena corinna Orchymont, 1936 i c g
 * Hydraena cornelli Jäch and Díaz, 1998 i c g
 * Hydraena corrugis Orchymont, 1934 i c g
 * Hydraena coryleti Jäch, 1992 i c g
 * Hydraena costiniceps Perkins, 1980 i c g
 * Hydraena crepidoptera Jäch, 1992 i c g
 * Hydraena cristatigena Jäch and Díaz, 2000 i c g
 * Hydraena croatica Kuwert, 1888 i c g
 * Hydraena cryptostoma Jäch, 1992 i c g
 * Hydraena crystallina Perkins, 1980 i c g
 * Hydraena cubista Perkins, 2007 i c g
 * Hydraena cultrata Perkins, 2007 i c g
 * Hydraena cunicula Perkins, 2011 i c g
 * Hydraena cunninghamensis Perkins, 2007 i c g
 * Hydraena curta Kiesenwetter, 1849 i c g
 * Hydraena curtipalpis Jäch and Díaz, 1998 i c g
 * Hydraena curvipes Jäch and Díaz, 2012 i c g
 * Hydraena curvosa Perkins, 2011 i c g
 * Hydraena cuspidicollis Perkins, 1980 i c g
 * Hydraena cyclops Jäch and Díaz, 2000 i c g
 * Hydraena cygnus Zwick, 1977 i c g
 * Hydraena czernohorskyi Müller, 1911 i c g
 * Hydraena dalmatina Ganglbauer, 1901 i c g
 * Hydraena damascena Pic, 1910 i c g
 * Hydraena dariensis Perkins, 2011 i c g
 * Hydraena darwini Perkins, 2007 i c g
 * Hydraena d-concava Perkins, 2011 i c g
 * Hydraena d-destina Perkins, 1980 i c g
 * Hydraena debeckeri (Janssens, 1972) i c g
 * Hydraena decepta Perkins, 2011 i c g
 * Hydraena decipiens Zwick, 1977 i c g
 * Hydraena decolor Sainte-Claire Deville, 1903 i c g
 * Hydraena decui Spangler, 1980 i c g
 * Hydraena delia Balfour-Browne, 1978 i c g
 * Hydraena deliquesca Perkins, 2007 i c g
 * Hydraena delvasi Delgado and Collantes, 1996 i c g
 * Hydraena densa Fauvel, 1883 i c g
 * Hydraena dentipalpis Reitter, 1888 i c g
 * Hydraena dentipes Germar, 1824 i c g
 * Hydraena devillei Ganglbauer, 1901 i c g
 * Hydraena devincta Orchymont, 1940 i c g
 * Hydraena diadema Perkins, 2011 i c g
 * Hydraena diazi Trizzino, Jäch and Ribera in Trizzino, Jäch, Audisio and Rivera, 2011 i c g
 * Hydraena diffusa Perkins, 2011 i c g
 * Hydraena dilutipes Fairmaire, 1898 i c g
 * Hydraena dimorpha Orchymont, 1922 i c g
 * Hydraena dinosaurophila Jäch, 1994 i c g
 * Hydraena discicollis Fairmaire, 1898 i c g
 * Hydraena discreta Ganglbauer, 1904 i c g
 * Hydraena disparamera Perkins, 2007 i c g
 * Hydraena dochula Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena dolichogaster Janssens, 1965 i c g
 * Hydraena dorrigoensis Perkins, 2007 i c g
 * Hydraena draconisaurati Jäch and Díaz, 2005 i c g
 * Hydraena dudgeoni Perkins, 2011 i c g
 * Hydraena duodecimata Perkins, 2014 i c g
 * Hydraena duohamata Perkins, 2011 i c g
 * Hydraena ebriimadli Jäch, 1988 i c g
 * Hydraena ecuadormica Perkins, 2011 i c g
 * Hydraena egoni Jäch, 1986 i c g
 * Hydraena eichleri Orchymont, 1937 i c g
 * Hydraena einsteini Perkins, 2011 i c g
 * Hydraena elephanta Perkins, 2014 i c g
 * Hydraena elisabethae Jäch, 1992 i c g
 * Hydraena eliya Jäch, 1982 i c g
 * Hydraena emarginata Rey, 1885 i c g
 * Hydraena emineae Jäch and Kasapoglu, 2006 i c g
 * Hydraena epeirosi Ferro, 1985 i c g
 * Hydraena errina Orchymont, 1948 i c g
 * Hydraena erythraea Régimbart, 1905 i c g
 * Hydraena eryx Orchymont, 1948 i c g
 * Hydraena esquinita Brojer and Jäch, 2011 i c g
 * Hydraena essentia Perkins, 2011 i c g
 * Hydraena eucnemis Janssens, 1970 i c g
 * Hydraena evanescens Rey, 1884 i c g
 * Hydraena evansi Balfour-Browne, 1945 i c g
 * Hydraena exarata Kiesenwetter, 1866 i c g
 * Hydraena exasperata Orchymont, 1935 i c g
 * Hydraena excisa Kiesenwetter, 1849 i c g
 * Hydraena exhalista Perkins, 2011 i c g
 * Hydraena exilipes Perkins, 1980 i c g
 * Hydraena expedita Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena explanata Pic, 1905 i c g
 * Hydraena extorris Zwick, 1977 i c g
 * Hydraena falcata Jäch, 1992 i c g
 * Hydraena farsensis Skale and Jäch, 2011 i c g
 * Hydraena fasciata Perkins, 2011 i c g
 * Hydraena fascinata Perkins, 2011 i c g
 * Hydraena fasciola Perkins, 2011 i c g
 * Hydraena fasciolata Perkins, 2011 i c g
 * Hydraena fasciopaca Perkins, 2011 i c g
 * Hydraena favulosa Perkins, 2014 i c g
 * Hydraena fenestella Perkins, 2011 i c g
 * Hydraena ferethula Perkins, 2007 i c g
 * Hydraena feryi Skale and Jäch, 2011 i c g
 * Hydraena feuerborni Orchymont, 1932 i c g
 * Hydraena fijiensis Balfour-Browne, 1945 i c g
 * Hydraena filum Sahlberg, 1908 i c g
 * Hydraena finita Orchymont, 1943 i c g
 * Hydraena finki Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena finniganensis Perkins, 2007 i c g
 * Hydraena fiorii Porta, 1899 i c g
 * Hydraena fischeri Schönmann, 1991 i c g
 * Hydraena flagella Perkins, 2011 i c g
 * Hydraena fluvicola (Perkins, 1980) i c g
 * Hydraena foliobba Perkins, 2011 i c g
 * Hydraena fontana Orchymont, 1932 i c g
 * Hydraena fontiscarsavii (Jäch, 1988) i c g
 * Hydraena formosapala Perkins, 2011 i c g
 * Hydraena formula Orchymont, 1932 i c g
 * Hydraena forticollis Perkins, 2007 i c g
 * Hydraena fosterorum Trizzino, Jäch and Ribera in Trizzino, Jäch, Audisio and Rivera, 2011 i c g
 * Hydraena franklyni Deler-Hernández and Delgado, 2012 i c g
 * Hydraena freitagi Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena frenzeli Skale and Jäch, 2008 i c g
 * Hydraena fritzi Jäch, 1992 i c g
 * Hydraena frondsicola (Perkins, 1980) i c g
 * Hydraena funda Perkins, 2011 i c g
 * Hydraena fundacta Perkins, 2011 i c g
 * Hydraena fundaequalis Perkins, 2007 i c g
 * Hydraena fundapta Perkins, 2011 i c g
 * Hydraena fundarca Perkins, 2011 i c g
 * Hydraena fundata Perkins, 2007 i c g
 * Hydraena fundextra Perkins, 2011 i c g
 * Hydraena furthi Jäch, 1982 i c g
 * Hydraena gaditana Lagar and Fresneda, 1990 i c g
 * Hydraena galatica Janssens, 1970 i c g
 * Hydraena galea Perkins, 2011 i c g
 * Hydraena gavarrensis Jäch, Díaz and Martinoy, 2005 i c g
 * Hydraena geminya Perkins, 1980 i c g
 * Hydraena genumorpha Perkins, 2014 i c g
 * Hydraena georgiadesi Orchymont, 1931 i c g
 * Hydraena geraldneuhauseri Jäch and Díaz, 2006 i c g
 * Hydraena germaini Orchymont, 1923 i c g
 * Hydraena glassmani Jäch, 1986 i c g
 * Hydraena gnatella Orchymont, 1945 i c g
 * Hydraena gnatelloides Orchymont, 1945 i c g
 * Hydraena gracilidelphis Trizzino, Valladares, Garrido and Audisio, 2012 i c g
 * Hydraena gracilis Germar, 1824 i c g
 * Hydraena graciloides (Jäch, 1988) i c g
 * Hydraena grandis Reitter, 1885 i c g
 * Hydraena graphica Orchymont, 1931 i c g
 * Hydraena grata Orchymont, 1944 i c g
 * Hydraena gregalis Orchymont, 1944 i c g
 * Hydraena gressa Orchymont, 1944 i c g
 * Hydraena griphus Orchymont, 1944 i c g
 * Hydraena grouvellei Orchymont, 1923 i c g
 * Hydraena grueberi Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena guadelupensis Orchymont, 1923 i c g
 * Hydraena guangxiensis Jäch and Díaz, 2005 i c g
 * Hydraena guatemala Perkins, 1980 i c g
 * Hydraena guentheri Jäch, 1992 i c g
 * Hydraena guilin Jäch and Díaz, 2005 i c g
 * Hydraena gynaephila Jäch, 1997 i c g
 * Hydraena habitiva Perkins, 2014 i c g
 * Hydraena hainzi Jäch, 1988 i c g
 * Hydraena haitensis Perkins, 1980 i c g
 * Hydraena hajeki Skale and Jäch, 2011 i c g
 * Hydraena hamifera Zwick, 1977 i c g
 * Hydraena hansreuteri Jäch and Díaz, 2005 i c g
 * Hydraena hayashii Jäch and Díaz, 2012 i c g
 * Hydraena helena Orchymont, 1929 i c g
 * Hydraena hendrichi Jäch, Díaz and Skale, 2013 i c g
 * Hydraena hernandoi Fresneda and Lagar, 1990 i c g
 * Hydraena herzogestella Perkins, 2011 i c g
 * Hydraena heterogyna Bedel, 1898 i c g
 * Hydraena hiekei Jäch, 1992 i c g
 * Hydraena hillaryi Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena hintoni Perkins, 2011 i c g
 * Hydraena hispanica Ganglbauer, 1901 i c g
 * Hydraena holdhausi Pretner, 1929 i c g
 * Hydraena hornabrooki Perkins, 2011 i c g
 * Hydraena hortensis Jäch and Díaz, 2000 i c g
 * Hydraena hosiwergi Freitag and Jäch, 2007 i c g
 * Hydraena hosseinieorum Bilton and Jäch, 1998 i c g
 * Hydraena huangshanensis Jäch and Díaz, 2005 i c g
 * Hydraena huitongensis Jäch and Díaz, 2005 i c g
 * Hydraena humanica Perkins, 2014 i c g
 * Hydraena hunanensis Pu, 1951 i c g
 * Hydraena hungarica Rey, 1884 i c g
 * Hydraena huonica Perkins, 2011 i c g
 * Hydraena hyalina Perkins, 1980 i c g
 * Hydraena hynesi Zwick, 1977 i c g
 * Hydraena hypipamee Perkins, 2007 i c g
 * Hydraena ibalimi Perkins, 2011 i c g
 * Hydraena iberica Orchymont, 1936 i c g
 * Hydraena idema Perkins, 2011 i c g
 * Hydraena iheya Jäch and Díaz, 1999 i c g
 * Hydraena ilamensis Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena ilica Jäch, 1994 i c g
 * Hydraena imbria Jäch and Díaz, 2001 i c g
 * Hydraena impala Perkins, 2011 i c g
 * Hydraena imperatrix Kniz, 1919 i c g
 * Hydraena impercepta Zwick, 1977 i c g
 * Hydraena impressicollis Fairmaire, 1898 i c g
 * Hydraena inancala Perkins, 2007 i c g
 * Hydraena inapicipalpis Pic, 1918 i c g
 * Hydraena incisiva Perkins, 2011 i c g
 * Hydraena incista Perkins, 2011 i c g
 * Hydraena incurva Orchymont, 1932 i c g
 * Hydraena indiana Jäch, 1994 i c g
 * Hydraena indica Orchymont, 1920 i c g
 * Hydraena infoveola Perkins, 2011 i c g
 * Hydraena ingens (Perkins, 1980) i c g
 * Hydraena inhalista Perkins, 2011 i c g
 * Hydraena injectiva Perkins, 2014 i c g
 * Hydraena innuda Perkins, 2007 i c g
 * Hydraena inopinata Jäch and Díaz, 1998 i c g
 * Hydraena inplacopaca Perkins, 2011 i c g
 * Hydraena insandalia Perkins, 2011 i c g
 * Hydraena insita Orchymont, 1932 i c g
 * Hydraena insolita Orchymont, 1932 i c g
 * Hydraena insularis Orchymont, 1945 i c g
 * Hydraena integra Pretner, 1931 i c g
 * Hydraena intensa Perkins, 2011 i c g
 * Hydraena intermedia Rosenhauer, 1847 i c g
 * Hydraena intraangulata Perkins, 2007 i c g
 * Hydraena inusta Orchymont, 1932 i c g
 * Hydraena invicta Perkins, 2007 i c g
 * Hydraena iriomotensis Jäch and Díaz, 1999 i c g
 * Hydraena isabelae Castro and Herrera, 2001 i c g
 * Hydraena isolinae Jäch and Díaz, 1998 i c g
 * Hydraena ispirensis Kasapoglu, Jäch and Skale, 2010 i c g
 * Hydraena iterata Orchymont, 1948 i c g
 * Hydraena jacobsoni Orchymont, 1932 i c g
 * Hydraena jaechiana (Audisio and De Biase, 1990) i c g
 * Hydraena jaegeri Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena jailensis Breit, 1917 i c g
 * Hydraena janczyki Jäch, 1992 i c g
 * Hydraena janeceki Jäch, 1987 i c g
 * Hydraena janssensi Nilsson, 2001 i c g
 * Hydraena jengi Jäch and Díaz, 1998 i c g
 * Hydraena jilanzhui Jäch and Díaz, 2005 i c g
 * Hydraena jivaro Perkins, 1980 i c g
 * Hydraena johncoltranei Perkins, 2011 i c g
 * Hydraena jubilata Perkins, 2011 i c g
 * Hydraena kadowakii Jäch and Díaz, 2012 i c g
 * Hydraena kakadu Perkins, 2007 i c g
 * Hydraena kamitei Jäch and Díaz, 2012 i c g
 * Hydraena karinkukolae Jäch, 1989 i c g
 * Hydraena karmai Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena kasyi Jäch, 1992 i c g
 * Hydraena kaufmanni Ganglbauer, 1901 i c g
 * Hydraena kellymilleri Perkins, 2011 i c g
 * Hydraena khnzoriani Janssens, 1968 i c g
 * Hydraena kilimandjarensis Régimbart, 1906 i c g
 * Hydraena kitayamai Jäch and Díaz, 2012 i c g
 * Hydraena knischi Orchymont, 1928 i c g
 * Hydraena kocheri Berthélemy, 1992 i c g
 * Hydraena kodadai Freitag and Jäch, 2007 i c g
 * Hydraena koje Perkins, 2011 i c g
 * Hydraena koma Perkins, 2011 i c g
 * Hydraena krasnodarensis Jäch and Díaz, 2006 i c g
 * Hydraena kroumiriana Kaddouri, 1992 i c g
 * Hydraena kucinici Micetic Stankovic and Jäch, 2012 i c g
 * Hydraena kuehnelti Jäch, 1989 i c g
 * Hydraena kurdistanica Jäch, 1988 i c g
 * Hydraena kwangsiensis Pu, 1951 i c g
 * Hydraena labropaca Perkins, 2011 i c g
 * Hydraena lagamba Brojer and Jäch, 2011 i c g
 * Hydraena lapidicola Kiesenwetter, 1849 i c g
 * Hydraena lapissectilis Jäch, 1992 i c g
 * Hydraena larissae Jäch and Díaz, 2000 i c g
 * Hydraena larsoni Perkins, 2007 i c g
 * Hydraena lascrucensis Brojer and Jäch, 2011 i c g
 * Hydraena lassulipes Perkins, 2011 i c g
 * Hydraena latebricola Jäch, 1986 i c g
 * Hydraena latisoror Perkins, 2007 i c g
 * Hydraena lazica Janssens, 1963 i c g
 * Hydraena leechi Perkins, 1980 i c g
 * Hydraena leei Jäch and Díaz, 1998 i c g
 * Hydraena legorskyi Jäch and Brojer, 2012 i c g
 * Hydraena lehmanni Jäch and Díaz, 2005 i c g
 * Hydraena leonhardi Breit, 1916 i c g
 * Hydraena leprieuri Sainte-Claire Deville, 1905 i c g
 * Hydraena levantina Sahlberg, 1908 i c g
 * Hydraena ligulipes Jäch, 1988 i c g
 * Hydraena lilianae Perkins, 2011 i c g
 * Hydraena limbobesa Perkins, 2011 i c g
 * Hydraena limpidicollis Perkins, 1980 i c g
 * Hydraena liriope Orchymont, 1943 i c g
 * Hydraena longicollis Sharp, 1882 i c g
 * Hydraena loripes Perkins, 2011 i c g
 * Hydraena lotti Bilton, 2013 i c g
 * Hydraena lucasi Lagar, 1984 i c g
 * Hydraena lucernae Zwick, 1977 i c g
 * Hydraena ludovicae Orchymont, 1931 i c g
 * Hydraena luminicollis Perkins, 2007 i c g
 * Hydraena luridipennis MacLeay, 1873 i c g
 * Hydraena lusitana (Berthélemy in Berthélemy and Whytton Da Terra, 1977) i c g
 * Hydraena lycia Jäch, 1988 i c g
 * Hydraena macedonica Orchymont, 1931 i c g
 * Hydraena maculicollis Champion, 1920 i c g
 * Hydraena maculopala Perkins, 2011 i c g
 * Hydraena madronensis Castor, García and Ferreras, 2000 i c g
 * Hydraena magna Pu, 1951 i c g
 * Hydraena magnessa Jäch, 1997 i c g
 * Hydraena magnetica Zwick, 1977 i c g
 * Hydraena mahensis Scott, 1913 i c g
 * Hydraena malagricola Jäch and Díaz, 2012 i c g
 * Hydraena malickyi Jäch, 1989 i c g
 * Hydraena malkini Perkins, 1980 i c g
 * Hydraena manabica Perkins, 2011 i c g
 * Hydraena manaslu Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena manfredjaechi Delgado and Soler, 1991 i c g
 * Hydraena manguao Freitag and Jäch, 2007 i c g
 * Hydraena manulea Perkins, 2011 i c g
 * Hydraena manuloides Perkins, 2011 i c g
 * Hydraena marawaka Perkins, 2011 i c g
 * Hydraena marcosae Aguilera, Hernando and Ribera, 1997 i c g
 * Hydraena marginicollis Kiesenwetter, 1849 i c g
 * Hydraena mariannae Jäch, 1992 i c g
 * Hydraena marinae Castro, 2003 i c g
 * Hydraena martensi Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena martinschoepfi Jäch and Díaz, 2005 i c g
 * Hydraena masatakai Jäch and Díaz, 2003 i c g
 * Hydraena maureenae Perkins, 1980 i c g
 * Hydraena mauriciogarciai Perkins, 2011 i c g
 * Hydraena mazamitla Perkins, 1980 i c g
 * Hydraena mecai Millán and Aguilera, 2000 i c g
 * Hydraena melas Dalla Torre, 1877 i c g
 * Hydraena mercuriala Perkins, 2011 i c g
 * Hydraena meschniggi Pretner, 1929 i c g
 * Hydraena metzeni Perkins, 2007 i c g
 * Hydraena mexicana Perkins, 1980 i c g
 * Hydraena mianminica Perkins, 2011 i c g
 * Hydraena michaelbalkei Jäch, Díaz and Skale, 2013 i c g
 * Hydraena mignymixys Perkins, 1980 i c g
 * Hydraena millerorum Perkins, 2007 i c g
 * Hydraena miniretia Perkins, 2007 i c g
 * Hydraena mintrita Perkins, 2011 i c g
 * Hydraena mitchellensis Perkins, 2007 i c g
 * Hydraena miyatakei Satô, 1959 i c g
 * Hydraena modili Jäch, 1988 i c g
 * Hydraena monikae Jäch and Díaz, 2000 i c g
 * Hydraena monscassius Jäch, 1988 i c g
 * Hydraena monstruosipes Ferro, 1986 i c g
 * Hydraena monteithi Perkins, 2007 i c g
 * Hydraena morio Kiesenwetter, 1849 i c g
 * Hydraena motzfeldi Skale and Jäch, 2011 i c g
 * Hydraena mouzaiensis Sainte-Claire Deville, 1909 i c g
 * Hydraena mpumalanga Perkins, 2014 i c g
 * Hydraena muelleri Pretner, 1931 i c g
 * Hydraena muezziginea Jäch, 1988 i c g
 * Hydraena multiloba Perkins, 2011 i c g
 * Hydraena multimurata Perkins, 2014 i c g
 * Hydraena multispina Perkins, 2011 i c g
 * Hydraena mylasae Jäch, 1992 i c g
 * Hydraena namibiensis Perkins, 2014 i c g
 * Hydraena nanocolorata Perkins, 2011 i c g
 * Hydraena nanopala Perkins, 2011 i c g
 * Hydraena nanoscintilla Perkins, 2011 i c g
 * Hydraena natiforma Perkins, 2014 i c g
 * Hydraena neblina Perkins, 2011 i c g
 * Hydraena nelsonmandelai Makhan, 2008 i c g
 * Hydraena neoaccurata Perkins, 2014 i c g
 * Hydraena nevermanni Perkins, 1980 i c g
 * Hydraena newtoni Perkins, 1980 i c g
 * Hydraena nielshaggei Freitag and Jäch, 2007 i c g
 * Hydraena nigra Hatch, 1965 i c g
 * Hydraena nigrita Germar, 1824 i c g
 * Hydraena nike Jäch, 1995 i c g
 * Hydraena nilguenae (Jäch, 1988) i c g
 * Hydraena nitidimenta Perkins, 2011 i c g
 * Hydraena nivalis Jäch, 1992 i c g
 * Hydraena nomenipes Perkins, 2014 i c g
 * Hydraena notsui Satô, 1978 i c g
 * Hydraena novacula Perkins, 2011 i c g
 * Hydraena numidica Sainte-Claire Deville, 1905 i c g
 * Hydraena nurabadensis Skale and Jäch, 2011 i c g
 * Hydraena nuratauensis Jäch, 1994 i c g
 * Hydraena oaxaca Perkins, 1980 i c g
 * Hydraena oblio Perkins, 1980 i c g
 * Hydraena occidentalis Perkins, 1980 i c g
 * Hydraena occitana (Audisio and De Biase, 1995) i c g
 * Hydraena okapa Perkins, 2011 i c g
 * Hydraena okinawensis Jäch and Díaz, 1999 i c g
 * Hydraena olidipastoris Jäch, 1988 i c g
 * Hydraena ollopa Perkins, 2011 i c g
 * Hydraena optica Jäch and Díaz, 2012 i c g
 * Hydraena orchis Jäch and Díaz, 1998 i c g
 * Hydraena orcula Perkins, 1980 i c g
 * Hydraena ordishi Delgado and Palma, 1997 i c g
 * Hydraena orientalis Breit, 1916 i c g
 * Hydraena ortali Jäch, 1986 i c g
 * Hydraena orthosia Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006 i c g
 * Hydraena otiarca Perkins, 2011 i c g
 * Hydraena ovata Janssens, 1961 i c g
 * Hydraena owenobesa Perkins, 2011 i c g
 * Hydraena oxiana Janssens, 1974 i c g
 * Hydraena ozarkensis Perkins, 1980 i c g
 * Hydraena pachyptera Apfelbeck, 1909 i c g
 * Hydraena pacifica Perkins, 1980 i c g
 * Hydraena pacificica Perkins, 2011 i c g
 * Hydraena paeminosa Perkins, 1980 i c g
 * Hydraena pagaluensis Hernando and Ribera, 2001 i c g
 * Hydraena paganettii Ganglbauer, 1901 i c g
 * Hydraena pajarita Brojer and Jäch, 2011 i c g
 * Hydraena pakistanica Jäch, 1992 i c g
 * Hydraena pala Perkins, 2011 i c g
 * Hydraena palamita Perkins, 2011 i c g
 * Hydraena palawanensis Freitag and Jäch, 2007 i c g
 * Hydraena pallidula Sainte-Claire Deville, 1909 i c g
 * Hydraena palustris Erichson, 1837 i c g
 * Hydraena pamirica Jäch, 1992 i c g
 * Hydraena pamphylia Jäch and Díaz, 2001 i c g
 * Hydraena pangaei Jäch, 1992 i c g
 * Hydraena pantanalensis Perkins, 2011 i c g
 * Hydraena paraguayensis Janssens, 1972 i c g
 * Hydraena parciplumea Perkins, 2007 i c g
 * Hydraena particeps Perkins, 1980 i c g
 * Hydraena parva Zwick, 1977 i c g
 * Hydraena parysatis Janssens, 1981 i c g
 * Hydraena paucistriata Jäch and Díaz, 2000 i c g
 * Hydraena paulmoritz Jäch, Díaz and Skale, 2013 i c g
 * Hydraena pavicula Perkins, 1980 i c g
 * Hydraena paxillipes Perkins, 2011 i c g
 * Hydraena peckorum Perkins, 2011 i c g
 * Hydraena pectenata Perkins, 2011 i c g
 * Hydraena pedroaguilerai Perkins, 2011 i c g
 * Hydraena pegopyga Perkins, 2011 i c g
 * Hydraena pelops Jäch, 1995 i c g
 * Hydraena pennsylvanica Kiesenwetter, 1849 b
 * Hydraena pensylvanica Kiesenwetter, 1849 i c g
 * Hydraena penultimata Perkins, 2011 i c g
 * Hydraena perkinsi Spangler, 1980 i c g
 * Hydraena perlonga Balfour-Browne, 1950 i c g
 * Hydraena perpunctata Perkins, 2011 i c g
 * Hydraena persica Janssens, 1981 i c g
 * Hydraena pertransversa Perkins, 2011 i c g
 * Hydraena peru Perkins, 1980 i c g
 * Hydraena pesici Skale and Jäch, 2011 i c g
 * Hydraena petila Perkins, 1980 i c g
 * Hydraena phainops Perkins, 2011 i c g
 * Hydraena phallerata Orchymont, 1944 i c g
 * Hydraena phallica Orchymont, 1930 i c g
 * Hydraena phassilyi Orchymont, 1931 i c g
 * Hydraena philippi Jäch and Díaz, 2005 i c g
 * Hydraena philyra Orchymont, 1944 i c g
 * Hydraena phoenicia Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006 i c g
 * Hydraena photogenica Perkins, 2011 i c g
 * Hydraena pici Sainte-Claire Deville, 1905 i c g
 * Hydraena picula Perkins, 2011 i c g
 * Hydraena pilimera Brojer and Jäch, 2011 i c g
 * Hydraena pilipes Zwick, 1977 i c g
 * Hydraena pilulambra Perkins, 2011 i c g
 * Hydraena pindica Janssens, 1965 i c g
 * Hydraena pisciforma Perkins, 2014 i c g
 * Hydraena planata Kiesenwetter, 1849 i c g
 * Hydraena plastica Orchymont, 1943 i c g
 * Hydraena platycnemis Jäch, 1988 i c g
 * Hydraena platynaspis Jäch, 1988 i c g
 * Hydraena platysoma Janssens, 1968 i c g
 * Hydraena plaumanni Orchymont, 1937 i c g
 * Hydraena plumipes Rey, 1886 i c g
 * Hydraena pluralticola Perkins, 2011 i c g
 * Hydraena plurifurcata Jäch and Díaz, 1998 i c g
 * Hydraena polita Kiesenwetter, 1849 i c g
 * Hydraena pontequula Perkins, 1980 i c g
 * Hydraena pontica Janssens, 1963 i c g
 * Hydraena porchi Perkins, 2007 i c g
 * Hydraena porcula Jäch and Díaz, 1998 i c g
 * Hydraena praetermissa Jäch, 1987 i c g
 * Hydraena premordica Perkins, 1980 i c g
 * Hydraena pretneri Chiesa, 1927 i c g
 * Hydraena prieto Perkins, 1980 i c g
 * Hydraena princeps Fauvel, 1903 i c g
 * Hydraena processa Perkins, 2011 i c g
 * Hydraena producta Mulsant and Rey, 1852 i c g
 * Hydraena proesei Skale and Jäch, 2011 i c g
 * Hydraena profunda Perkins, 2014 i c g
 * Hydraena prokini Jäch and Díaz, 2006 i c g
 * Hydraena propria Perkins, 2011 i c g
 * Hydraena prusensis Jäch, 1992 i c g
 * Hydraena pseudocirrata Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena pseudopalawanensis Freitag and Jäch, 2007 i c g
 * Hydraena pseudoriparia Orchymont, 1945 i c g
 * Hydraena puetzi Jäch, 1994 i c g
 * Hydraena pugillista Perkins, 2007 i c g
 * Hydraena pulchella Germar, 1824 i c g
 * Hydraena pulsatrix Perkins, 1980 i c g
 * Hydraena punctata LeConte, 1855 i c g
 * Hydraena puncticollis Sharp, 1882 i c g
 * Hydraena punctilata Perkins, 2011 i c g
 * Hydraena putearius Jäch and Díaz, 2000 i c g
 * Hydraena pygmaea Waterhouse, 1833 i c g
 * Hydraena quadrata (Janssens, 1980) i c g
 * Hydraena quadricollis Wollaston, 1864 i c g
 * Hydraena quadricurvipes Perkins, 1980 i c g
 * Hydraena quadriplumipes Perkins, 2011 i c g
 * Hydraena quechua Perkins, 1980 i c g
 * Hydraena queenslandica Perkins, 2007 i c g
 * Hydraena quetiae Castro, 2000 i c g
 * Hydraena quilisi Lagar, Fresneda and Fernando, 1987 i c g
 * Hydraena quintana Perkins, 2011 i c g
 * Hydraena ramuensis Perkins, 2011 i c g
 * Hydraena ramuquintana Perez, 2011 i c g
 * Hydraena receptiva Perkins, 2011 i c g
 * Hydraena reflectiva Perkins, 2014 i c g
 * Hydraena regimbarti Zaitzev, 1908 i c g
 * Hydraena remulipes Perkins, 2011 i c g
 * Hydraena reticulata Zwick, 1977 i c g
 * Hydraena reticuloides Perkins, 2007 i c g
 * Hydraena reticulositis Perkins, 2007 i c g
 * Hydraena revelovela Perkins, 2007 i c g
 * Hydraena reverberata Perkins, 2011 i c g
 * Hydraena reyi Kuwert, 1888 i c g
 * Hydraena rhinoceros (Janssens, 1972) i c g
 * Hydraena rhodia Jäch, 1985 i c g
 * Hydraena riberai Jäch, Aguilera and Hernando, 1998 i c g
 * Hydraena richardimbi Jäch, 1992 i c g
 * Hydraena rigua Orchymont, 1931 i c g
 * Hydraena ripaeaureae (Janssens, 1972) i c g
 * Hydraena riparia Kugelann, 1794 i c g
 * Hydraena rivularis Guillebeau, 1896 i c g
 * Hydraena robusta Zwick, 1977 i c g
 * Hydraena rosannae Audisio, Trizzino and De Biase in Audisio, Trizzino, De Biase, Mancini and Antonini, 2009 i c g
 * Hydraena rudallensis Blackburn, 1896 i c g
 * Hydraena rufipennis Boscá Berga, 1932 i c g
 * Hydraena rufipes Curtis, 1830 i c g
 * Hydraena rugosa Mulsant, 1844 i c g
 * Hydraena ruinosa Zwick, 1977 i c g
 * Hydraena rukiyeae Kasapoglu, Jäch and Skale, 2010 i c g
 * Hydraena sabella Perkins, 1980 i c g
 * Hydraena saga Orchymont, 1930 i c g
 * Hydraena sagatai Perkins, 2011 i c g
 * Hydraena sahlbergi Orchymont, 1923 i c g
 * Hydraena saluta Perkins, 2011 i c g
 * Hydraena samia Jäch, 1986 i c g
 * Hydraena samnitica Knisch, 1924 i c g
 * Hydraena sanagergelyae Brojer and Jäch, 2011 i c g
 * Hydraena sanfilippoi (Audisio and De Biase, 1995) i c g
 * Hydraena sappho Janssens, 1965 i c g
 * Hydraena sardoa Binaghi, 1961 i c g
 * Hydraena satoi Jäch and Díaz, 1999 i c g
 * Hydraena sautakei Jäch and Díaz, 1999 i c g
 * Hydraena sauteri Orchymont, 1913 i c g
 * Hydraena scabra Orchymont, 1925 i c g
 * Hydraena scabrosa Orchymont, 1931 i c g
 * Hydraena schawalleri Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena schilfii Jäch, 1988 i c g
 * Hydraena schillhammeri Jäch, 1988 i c g
 * Hydraena schmidi Jäch and Díaz, 2001 i c g
 * Hydraena schoedli Jäch, 1992 i c g
 * Hydraena schoenmanni Jäch, 1988 i c g
 * Hydraena schubertorum Jäch and Díaz, 2001 i c g
 * Hydraena schuelkei Jäch, 1992 i c g
 * Hydraena schuleri Ganglbauer, 1901 i c g
 * Hydraena scintilla Perkins, 1980 i c g
 * Hydraena scintillabella Perkins, 1980 i c g
 * Hydraena scintillamima Perkins, 2011 i c g
 * Hydraena scintillapicta Perkins, 2011 i c g
 * Hydraena scintillarca Perkins, 2011 i c g
 * Hydraena scintillutea Perkins, 1980 i c g
 * Hydraena scitula Orchymont, 1943 i c g
 * Hydraena scolops Perkins, 1980 i c g
 * Hydraena scopula Perkins, 1980 i c g
 * Hydraena scythica Janssens, 1974 i c g
 * Hydraena sebastiani Perkins, 2014 i c g
 * Hydraena sepikramuensis Perkins, 2011 i c g
 * Hydraena septemlacuum Jäch, 1992 i c g
 * Hydraena serpentina Jäch, 1988 i c g
 * Hydraena serricollis Wollaston, 1864 i c g
 * Hydraena servilia Orchymont, 1936 i c g
 * Hydraena sexarcuata Perkins, 2011 i c g
 * Hydraena sexsuprema Perkins, 2011 i c g
 * Hydraena sharmai Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena sharpi Rey, 1886 i c g
 * Hydraena shorti Perkins, 2011 i c g
 * Hydraena sicula Kiesenwetter, 1849 i c g
 * Hydraena sidon Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006 i c g
 * Hydraena sierra Perkins, 1980 i c g
 * Hydraena similis Orchymont, 1930 i c g
 * Hydraena simonidea Orchymont, 1931 i c g
 * Hydraena simplicicollis Blackburn, 1896 i c g
 * Hydraena simplipes Zwick, 1977 i c g
 * Hydraena singaporensis Jäch, Díaz and Skale, 2013 i c g
 * Hydraena sinope Jäch, 1992 i c g
 * Hydraena smyrnensis Sahlberg, 1908 i c g
 * Hydraena socius Jäch and Díaz, 1999 i c g
 * Hydraena solarii Pretner, 1930 i c g
 * Hydraena solodovnikovi Jäch and Díaz, 2006 i c g
 * Hydraena sordida Sharp, 1882 i c g
 * Hydraena spangleri Perkins, 1980 i c g
 * Hydraena spatula Perkins, 2011 i c g
 * Hydraena speciosa Orchymont, 1944 i c g
 * Hydraena spinipes Baudi, 1882 i c g
 * Hydraena spinissima Perkins, 2007 i c g
 * Hydraena spinobesa Perkins, 2011 i c g
 * Hydraena splecoma Perkins, 1980 i c g
 * Hydraena squalida Orchymont, 1932 i c g
 * Hydraena stefani Jäch and Díaz, 2005 i c g
 * Hydraena steineri Perkins, 2011 i c g
 * Hydraena stellula Perkins, 2011 i c g
 * Hydraena storeyi Perkins, 2007 i c g
 * Hydraena striolata Perkins, 2011 i c g
 * Hydraena stussineri Kuwert, 1888 i c g
 * Hydraena subacuminata Rey, 1884 i c g
 * Hydraena subgrandis Jäch, 1988 i c g
 * Hydraena subimpressa Rey, 1885 i c g
 * Hydraena subina Orchymont, 1944 i c g
 * Hydraena subinflata Orchymont, 1944 i c g
 * Hydraena subinoides Orchymont, 1944 i c g
 * Hydraena subintegra Ganglbauer, 1901 i c g
 * Hydraena subinura Orchymont, 1944 i c g
 * Hydraena subirregularis Pic, 1918 i c g
 * Hydraena subjuncta Orchymont, 1930 i c g
 * Hydraena sublamina Orchymont, 1945 i c g
 * Hydraena sublapsa Orchymont, 1945 i c g
 * Hydraena subsequens Rey, 1886 i c g
 * Hydraena supersexa Perkins, 2011 i c g
 * Hydraena supina Perkins, 2011 i c g
 * Hydraena szechuanensis Pu, 1951 i c g
 * Hydraena takin Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena takutu Perkins, 2011 i c g
 * Hydraena tarsotricha Perkins, 2011 i c g
 * Hydraena tarvisina (Ferro, 1992) i c g
 * Hydraena tatii Sáinz-Cantero and Alba-Tercedor, 1989 i c g
 * Hydraena tauricola Jäch, 1988 i c g
 * Hydraena taxila Janssens, 1962 i c g
 * Hydraena tekmanensis Jäch, Skale and Kasapoglu, 2011 i c g
 * Hydraena tenjikuana Satô, 1979 i c g
 * Hydraena tenuis (Janssens, 1980) i c g
 * Hydraena tenuisella Perkins, 2007 i c g
 * Hydraena tenuisoror Perkins, 2007 i c g
 * Hydraena terebrans Jäch, 1992 i c g
 * Hydraena terralta Perkins, 1980 i c g
 * Hydraena testacea Curtis, 1830 i c g
 * Hydraena tetana Perkins, 2011 i c g
 * Hydraena textila Perkins, 2007 i c g
 * Hydraena thienemanni Orchymont, 1932 i c g
 * Hydraena thola Perkins, 2011 i c g
 * Hydraena tholasoris Perkins, 2011 i c g
 * Hydraena thumbelina Perkins, 2011 i c g
 * Hydraena thumbelipes Perkins, 2011 i c g
 * Hydraena thyene Balfour-Browne, 1958 i c g
 * Hydraena tiara Perkins, 2014 i c g
 * Hydraena tibiopaca Perkins, 2011 i c g
 * Hydraena tobogan Perkins, 2011 i c g
 * Hydraena torosopala Perkins, 2011 i c g
 * Hydraena torricellica Perkins, 2011 i c g
 * Hydraena transvallis Perkins, 2011 i c g
 * Hydraena trapezoidalis Zwick, 1977 i c g
 * Hydraena tricantha Zwick, 1977 i c g
 * Hydraena trichotarsa Perkins, 2011 i c g
 * Hydraena tricosipes Perkins, 2011 i c g
 * Hydraena tridigita Perkins, 2011 i c g
 * Hydraena tridisca Perkins, 2007 i c g
 * Hydraena triloba Perkins, 2007 i c g
 * Hydraena trinidensis Perkins, 1980 i c g
 * Hydraena triparamera Jäch, 1982 i c g
 * Hydraena tritropis Perkins, 2011 i c g
 * Hydraena tritutela Perkins, 2011 i c g
 * Hydraena truncata Rey, 1885 i c g
 * Hydraena tsushimaensis Jäch and Díaz, 2012 i c g
 * Hydraena tubuliphallis Jäch, 1982 i c g
 * Hydraena tucumanica Perkins, 1980 i c g
 * Hydraena tuolumne Perkins, 1980 i c g
 * Hydraena turcica Janssens, 1965 i c g
 * Hydraena turrialba Perkins, 1980 i c g
 * Hydraena tyrrhena Binaghi, 1961 i c g
 * Hydraena ulna Perkins, 2011 i c g
 * Hydraena umbolenta Perkins, 2011 i c g
 * Hydraena unca Valladares, 1989 i c g
 * Hydraena undevigintioctogintasisyphos Jäch and Díaz, 2005 i c g
 * Hydraena undulata Jäch and Díaz, 1998 i c g
 * Hydraena uniforma Perkins, 2014 i c g
 * Hydraena unita Perkins, 2011 i c g
 * Hydraena uzbekistanica Jäch, 1994 i c g
 * Hydraena vadosa Perkins, 2014 i c g
 * Hydraena valentini Jäch and Díaz, 2012 i c g
 * Hydraena vandykei Orchymont, 1923 i c g
 * Hydraena variopaca Perkins, 2011 i c g
 * Hydraena vedrasi Orchymont, 1931 i c g
 * Hydraena vela Perkins, 1980 i c g
 * Hydraena velvetina Perkins, 2011 i c g
 * Hydraena venezuela Perkins, 2011 i c g
 * Hydraena verberans Jäch and Díaz, 2006 i c g
 * Hydraena verstraeteni Ferro, 1984 i c g
 * Hydraena victoriae Jäch and Díaz, 1999 i c g
 * Hydraena vietnamensis (Janssens, 1972) i c g
 * Hydraena virginalis Janssens, 1963 i c g
 * Hydraena vodozi Sainte-Claire Deville, 1908 i c g
 * Hydraena vulgaris Jäch and Díaz, 2000 i c g
 * Hydraena waldheimi Jäch, 1987 i c g
 * Hydraena wangi Jäch and Díaz, 1998 i c g
 * Hydraena wangmiaoi Jäch and Díaz, 2005 i c g
 * Hydraena watanabei Jäch and Satô, 1988 i c g
 * Hydraena wattsi Perkins, 2007 i c g
 * Hydraena weigeli Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena weiri Perkins, 2007 i c g
 * Hydraena wencke Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena wewalkai Jäch, 1988 i c g
 * Hydraena williamsensis Deane, 1931 i c g
 * Hydraena wittmeri Satô, 1979 i c g
 * Hydraena wolfi Skale and Jäch in Jäch and Skale, 2009 i c g
 * Hydraena wrasei Jäch, 1992 i c g
 * Hydraena xingu Perkins, 2011 i c g
 * Hydraena yangae Jäch, Díaz and Skale, 2013 i c g
 * Hydraena yonaguniensis Jäch and Díaz, 2003 i c g
 * Hydraena yosemitensis Perkins, 1980 i c g
 * Hydraena yoshitomii Jäch and Díaz, 1999 i c g
 * Hydraena youngi Perkins, 1980 i c g
 * Hydraena ypsilon Zwick, 1977 i c g
 * Hydraena yunnanensis Pu, 1942 i c g
 * Hydraena zapatina Perkins, 1980 i c g
 * Hydraena zelandica Ordish, 1984 i c g
 * Hydraena zetteli Freitag and Jäch, 2007 i c g
 * Hydraena zezerensis Díaz Pazos and Bilton, 1995 i c g
 * Hydraena zimbabwensis Perkins, 2014 i c g
 * Hydraena zwicki Perkins, 2007 i c g

Data sources: i = ITIS, c = Catalogue of Life, g = GBIF, b = Bugguide.net