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

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

