There are at least 924 species in the genus
Hydraena: •
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 dinarica Freitag & de Vries, 2021 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, g = GBIF, ==References==