Hydraena

Hydraena is a genus of minute moss beetles in the family Hydraenidae. There are more than 990 described species in Hydraena.

Systematics

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 ^{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 ^{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 ^{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 ^{i c g}
Hydraena foliobba Perkins, 2011^{i c g}
Hydraena fontana Orchymont, 1932^{i c g}
Hydraena fontiscarsavii ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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 ^{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