Hydraena subinflata Orchymont, 1944

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Hydraena abbasigili Jäch, 1988

Hydraena abdita Orchymont, 1948

Hydraena abyssinica Régimbart, 1905

Hydraena accurata Orchymont, 1948

Hydraena achaica Jäch, 1995

Hydraena adrastea Orchymont, 1948

Hydraena aethaliensis Breit, 1917

Hydraena affirmata Perkins, 2007

Hydraena affusa Orchymont, 1936

Hydraena africana Kuwert, 1888

Hydraena akbesiana Audisio, De Biase and Jäch, 1993

Hydraena albai Sáinz-Cantero, 1993

Hydraena alberti Balfour-Browne, 1950

Hydraena alcantarana Ienistea, 1985

Hydraena algerina Kaddouri, 1992

Hydraena alia Orchymont, 1934

Hydraena aliciae Jäch and Díaz, 2005

Hydraena allomorpha Lagar & Fresneda, 1990

Hydraena alluaudi Régimbart, 1906

Hydraena alpicola Pretner, 1931

Hydraena altamirensis Díaz Pazos and Garrido Gonzales, 1993

Hydraena alternata Perkins, 1980

Hydraena alterra Perkins, 1980

Hydraena alticola Skale and Jäch, 2008

Hydraena ambiflagellata Zwick, 1977

Hydraena ambigua Ganglbauer, 1901

Hydraena ambiosina Perkins, 2007

Hydraena americana Jäch, 1993

Hydraena amidensis Jäch, 1988

Hydraena anaphora Perkins, 1980

Hydraena anatolica Janssens, 1963

Hydraena ancylis Perkins, 1980

Hydraena ancyrae Jäch, 1992

Hydraena andalusa Lagar & Fresneda, 1990

Hydraena andreinii Orchymont, 1934

Hydraena angulicollis Notman, 1921

Hydraena angulosa Mulsant, 1844

Hydraena angustata Sturm, 1836

Hydraena anisonycha Perkins, 1980

Hydraena antaria Perkins, 2007

Hydraena antiatlantica Jäch, Aguilera, and Hernando, 1998

Hydraena antiochena Jäch, 1988

Hydraena appalachicola Perkins, 1980

Hydraena appetita Perkins, 2007

Hydraena arabica Balfour-Browne, 1951

Hydraena arachthi Ferro & Jäch, 2000

Hydraena arcta Perkins, 2007

Hydraena arenicola Perkins, 1980

Hydraena argutipes Perkins, 1980

Hydraena ariana Janssens, 1962

Hydraena arizonica Perkins, 1980

Hydraena armata Reitter, 1880

Hydraena armeniaca Janssens, 1968

Hydraena armipalpis Jäch and Díaz, 2000

Hydraena armipes Rey, 1886

Hydraena arunensis Skale and Jäch in Jäch and Skale, 2009

Hydraena ascensa Perkins, 2007

Hydraena assimilis Rey, 1885

Hydraena athertonica Perkins, 2007

Hydraena atrata Desbrochers des Loges, 1891

Hydraena attaleiae Ferro, 1984

Hydraena audisioi Jäch, 1992

Hydraena aurita Jäch, 1988

Hydraena australica Zwick, 1977

Hydraena australula Perkins, 2007

Hydraena avuncula Jäch, 1988

Hydraena bactriana Janssens, 1962

Hydraena balearica Orchymont, 1930

Hydraena balfourbrownei Bameul, 1986

Hydraena balli Orchymont, 1940

Hydraena barbipes Zwick, 1977

Hydraena barricula Perkins, 1980

Hydraena barrosi Orchymont, 1934

Hydraena bedeli Barthélemy, 1992

Hydraena belgica Orchymont, 1930

Hydraena benjaminus Jäch and Díaz, 2006

Hydraena bensae Ganglbauer, 1901

Hydraena bergeri Janssens, 1972

Hydraena berthelemyana Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006

Hydraena berytus Jäch, 1986

Hydraena beyarslani Jäch, 1988

Hydraena bicolorata Jäch, 1997

Hydraena bicuspidata Ganglbauer, 1901

Hydraena bidefensa Perkins, 2007

Hydraena bihamata Champion, 1920

Hydraena biimpressa Perkins, 2007

Hydraena billi Zwick, 1977

Hydraena bilobata Jäch and Díaz, 1998

Hydraena bimagua Jäch, 1986

Hydraena birendra Skale and Jäch in Jäch and Skale, 2009

Hydraena bispinosa Pu, 1951

Hydraena bisulcata Rey, 1884

Hydraena bitruncata Orchymont, 1934

Hydraena bituberculata Perkins, 1980

Hydraena blackburni Zaitzev, 1908

Hydraena bodemeyeri Jäch and Díaz, 2001

Hydraena boetcheri Orchymont, 1932

Hydraena bolivari Orchymont, 1936

Hydraena bononiensis Binaghi, 1960

Hydraena borbonica Fairmaire, 1898

Hydraena bosnica Apfelbeck, 1909

Hydraena brachymera Orchymont, 1936

Hydraena bractea Perkins, 1980

Hydraena bractoides Perkins, 1980

Hydraena breedlovei Perkins, 1980

Hydraena brevis Sharp, 1882

Hydraena britteni Joy, 1907

Hydraena brittoni Zwick, 1977

Hydraena bromleyae Jäch, 1986

Hydraena browni Perkins, 1980

Hydraena bulgarica Breit, 1916

Hydraena busuanga Freitag and Jäch, 2007

Hydraena calcarifera Janssens, 1959

Hydraena californica Perkins, 1980

Hydraena campbelli Perkins, 1980

Hydraena canakcioglui Janssens, 1965

Hydraena canticacollis Perkins, 1980

Hydraena capacis Perkins, 2007

Hydraena capetribensis Perkins, 2007

Hydraena cappadocica Jäch, 1988

Hydraena capta Orchymont, 1936

Hydraena carbonaria Kiesenwetter, 1849

Hydraena carica Jäch, 1988

Hydraena carinulata Rey, 1886

Hydraena carniolica Pretner, 1970

Hydraena castanea Deane, 1937

Hydraena castanescens Freitag and Jäch, 2007

Hydraena cata Orchymont, 1943

Hydraena catalonica Fresneda, Aguilera & Hernando, 1994

Hydraena catherinae Bameul and Jäch, 2001

Hydraena caucasica Kuwert, 1888

Hydraena cephalleniaca Jäch, 1985

Hydraena cervisophila Jäch, 1992

Hydraena chenae Pu, 1951

Hydraena chersonesica Jäch, Díaz and Przewozny, 2007

Hydraena chiapa Perkins, 1980

Hydraena chiesai Janssens, 1965

Hydraena chifengi Jäch and Díaz, 1999

Hydraena chobauti Guillebeau, 1896

Hydraena christinae Audisio, De Biase & Jäch, 1996

Hydraena christoferi Jäch and Díaz, 2005

Hydraena ciliciensis Jäch, 1988

Hydraena circulata Perkins, 1980

Hydraena cirrata Champion, 1920

Hydraena claudia Freitag and Jäch, 2007

Hydraena clavigera Zwick, 1977

Hydraena clemens Jäch and Díaz, 2006

Hydraena colchica Janssens, 1963

Hydraena colombiana Perkins, 1980

Hydraena colymba Perkins, 1980

Hydraena compressipilis Jäch and Díaz, 1998

Hydraena concinna Orchymont, 1932

Hydraena confusa Pu, 1951

Hydraena connexa Orchymont, 1932

Hydraena converga Perkins, 2007

Hydraena coomani Orchymont, 1932

Hydraena cooperi Balfour-Browne, 1954

Hydraena cordata Schaufuss, 1883

Hydraena cordiformis Jäch and Díaz, 2000

Hydraena corinna Orchymont, 1936

Hydraena cornelli Jäch and Díaz, 1998

Hydraena corrugis Orchymont, 1934

Hydraena coryleti Jäch, 1992

Hydraena costiniceps Perkins, 1980

Hydraena crepidoptera Jäch, 1992

Hydraena cristatigena Jäch and Díaz, 2000

Hydraena croatica Kuwert, 1888

Hydraena cryptostoma Jäch, 1992

Hydraena crystallina Perkins, 1980

Hydraena cubista Perkins, 2007

Hydraena cultrata Perkins, 2007

Hydraena cunninghamensis Perkins, 2007

Hydraena curta Kiesenwetter, 1849

Hydraena curtipalpis Jäch and Díaz, 1998

Hydraena cuspidicollis Perkins, 1980

Hydraena cyclops Jäch and Díaz, 2000

Hydraena cygnus Zwick, 1977

Hydraena czernohorskyi Müller, 1911

Hydraena d-destina Perkins, 1980

Hydraena dalmatina Ganglbauer, 1901

Hydraena damascena Pic, 1910

Hydraena darwini Perkins, 2007

Hydraena debeckeri Janssens, 1972

Hydraena decipiens Zwick, 1977

Hydraena decolor Sainte-Claire Deville, 1903

Hydraena decui Spangler, 1980

Hydraena delia Balfour-Browne, 1978

Hydraena deliquesca Perkins, 2007

Hydraena delvasi Delgado and Collantes, 1996

Hydraena densa Fauvel, 1883

Hydraena dentipalpis Reitter, 1888

Hydraena dentipes Germar, 1842

Hydraena devillei Ganglbauer, 1901

Hydraena devincta Orchymont, 1940

Hydraena diazi Trizzino, Jäch and Ribera, 2011

Hydraena dilutipes Fairmaire, 1898

Hydraena dimorpha Orchymont, 1922

Hydraena dinosaurophila Jäch, 1994

Hydraena discicollis Fairmaire, 1898

Hydraena discreta Ganglbauer, 1904

Hydraena disparamera Perkins, 2007

Hydraena dochula Skale and Jäch in Jäch and Skale, 2009

Hydraena dolichogaster Janssens, 1965

Hydraena dorrigoensis Perkins, 2007

Hydraena draconisaurati Jäch and Díaz, 2005

Hydraena ebriimadli Jäch, 1988

Hydraena egoni Jäch, 1986

Hydraena eichleri Orchymont, 1937

Hydraena elisabethae Jäch, 1992

Hydraena eliya Jäch, 1982

Hydraena emarginata Rey, 1855

Hydraena emineae Jäch and Kasapoglu, 2006

Hydraena epeirosi Ferro, 1985

Hydraena errina Orchymont, 1948

Hydraena erythraea Régimbart, 1905

Hydraena eryx Orchymont, 1948

Hydraena eucnemis Janssens, 1970

Hydraena evanescens Rey, 1884

Hydraena evansi Balfour-Browne, 1945

Hydraena exarata Kiesenwetter, 1866

Hydraena exasperata Orchymont, 1935

Hydraena excisa Kiesenwetter, 1849

Hydraena exilipes Perkins, 1980

Hydraena expedita Skale and Jäch in Jäch and Skale, 2009

Hydraena explanata Pic, 1905

Hydraena extorris Zwick, 1977

Hydraena falcata Jäch, 1992

Hydraena ferethula Perkins, 2007

Hydraena feuerborni Orchymont, 1932

Hydraena fijiensis Balfour-Browne, 1945

Hydraena filum Sahlberg, 1908

Hydraena finita Orchymont, 1943

Hydraena finki Skale and Jäch in Jäch and Skale, 2009

Hydraena finniganensis Perkins, 2007

Hydraena fiorii Porta, 1899

Hydraena fischeri Schönmann, 1991

Hydraena fluvicola Perkins, 1980

Hydraena fontana Orchymont, 1932

Hydraena fontiscarsavii Jäch, 1988

Hydraena formula Orchymont, 1932

Hydraena forticollis Perkins, 2007

Hydraena fosterorum Trizzino, Jäch and Ribera, 2011

Hydraena freitagi Skale and Jäch in Jäch and Skale, 2009

Hydraena frenzeli Skale and Jäch, 2008

Hydraena fritzi Jäch, 1992

Hydraena frondsicola Perkins, 1980

Hydraena fundaequalis Perkins, 2007

Hydraena fundata Perkins, 2007

Hydraena furthi Jäch, 1982

Hydraena gaditana Lagar & Fresneda, 1990

Hydraena galatica Janssens, 1970

Hydraena gavarrensis Jäch, Díaz and Martinoy, 2005

Hydraena geminya Perkins, 1980

Hydraena georgiadesi Orchymont, 1931

Hydraena geraldneuhauseri Jäch and Díaz, 2006

Hydraena germaini Orchymont, 1923

Hydraena glassmani Jäch, 1986

Hydraena gnatella Orchymont, 1945

Hydraena gnatelloides Orchymont, 1945

Hydraena gracilis Germar, 1824

Hydraena graciloides Jäch, 1988

Hydraena grandis Reitter, 1885

Hydraena graphica Orchymont, 1931

Hydraena grata Orchymont, 1944

Hydraena gregalis Orchymont, 1944

Hydraena gressa Orchymont, 1944

Hydraena griphus Orchymont, 1944

Hydraena grouvellei Orchymont, 1923

Hydraena grueberi Skale and Jäch in Jäch and Skale, 2009

Hydraena guadelupensis Orchymont, 1923

Hydraena guangxiensis Jäch and Díaz, 2005

Hydraena guatemala Perkins, 1980

Hydraena guentheri Jäch, 1992

Hydraena guilin Jäch and Díaz, 2005

Hydraena gynaephila Jach, 1997

Hydraena hainzi Jäch, 1988

Hydraena haitensis Perkins, 1980

Hydraena hamifera Zwick, 1977

Hydraena hansreuteri Jäch and Díaz, 2005

Hydraena helena Orchymont, 1929

Hydraena hernandoi Fresneda & Lagar, 1990

Hydraena heterogyna Bedel, 1898

Hydraena hiekei Jäch, 1992

Hydraena hillaryi Skale and Jäch in Jäch and Skale, 2009

Hydraena hispanica Ganglbauer, 1901

Hydraena holdhausi Pretner, 1929

Hydraena hortensis Jäch & Díaz, 2000

Hydraena hosiwergi Freitag and Jäch, 2007

Hydraena hosseinieorum Bilton and Jäch, 1998

Hydraena huangshanensis Jäch and Díaz, 2005

Hydraena huitongensis Jäch and Díaz, 2005

Hydraena hunanensis Pu, 1951

Hydraena hungarica Rey, 1884

Hydraena hyalina Perkins, 1980

Hydraena hynesi Zwick, 1977

Hydraena hypipamee Perkins, 2007

Hydraena iberica Orchymont, 1936

Hydraena iheya Jäch and Díaz, 1999

Hydraena ilamensis Skale and Jäch in Jäch and Skale, 2009

Hydraena ilica Jäch, 1994

Hydraena imbria Jäch & Díaz, 2001

Hydraena imperatrix Kniz, 1919

Hydraena impercepta Zwick, 1977

Hydraena impressicollis Fairmaire, 1898

Hydraena inancala Perkins, 2007

Hydraena inapicipalpis Pic, 1918

Hydraena incurva Orchymont, 1932

Hydraena indiana Jäch, 1994

Hydraena indica Orchymont, 1920

Hydraena ingens Perkins, 1980

Hydraena innuda Perkins, 2007

Hydraena inopinata Jäch and Díaz, 1998

Hydraena insita Orchymont, 1932

Hydraena insolita Orchymont, 1932

Hydraena insularis Orchymont, 1945

Hydraena integra Pretner, 1931

Hydraena intermedia Rosenhauer, 1847

Hydraena intraangulata Perkins, 2007

Hydraena inusta Orchymont, 1932

Hydraena invicta Perkins, 2007

Hydraena iriomotensis Jäch and Díaz, 1999

Hydraena isabelae Castro & Herrera, 2001

Hydraena isolinae Jäch and Díaz, 1998

Hydraena ispirensis Kasapoglu, Jäch and Skale, 2010

Hydraena iterata Orchymont, 1948

Hydraena jacobsoni Orchymont, 1932

Hydraena jaechiana Audisio & De Biase, 1990

Hydraena jaegeri Skale and Jäch in Jäch and Skale, 2009

Hydraena jailensis Breit, 1917

Hydraena janczyki Jäch, 1992

Hydraena janeceki Jäch, 1987

Hydraena janssensi Nilsson, 2001

Hydraena jengi Jäch and Díaz, 1998

Hydraena jilanzhui Jäch and Díaz, 2005

Hydraena jivaro Perkins, 1980

Hydraena kakadu Perkins, 2007

Hydraena karinkukolae Jäch, 1989

Hydraena karmai Skale and Jäch in Jäch and Skale, 2009

Hydraena kasyi Jäch, 1992

Hydraena kaufmanni Ganglbauer, 1901

Hydraena khnzoriani Janssens, 1968

Hydraena kilimandjarensis Régimbart, 1906

Hydraena knischi Orchymont, 1928

Hydraena kocheri Berthélemy, 1992

Hydraena kodadai Freitag and Jäch, 2007

Hydraena krasnodarensis Jäch and Díaz, 2006

Hydraena kroumiriana Kaddouri, 1992

Hydraena kuehnelti Jäch, 1989

Hydraena kurdistanica Jäch, 1988

Hydraena kwangsiensis Pu, 1951

Hydraena lapidicola Kiesenwetter, 1849

Hydraena lapissectilis Jäch, 1992

Hydraena larissae Jäch & Díaz, 2000

Hydraena larsoni Perkins, 2007

Hydraena latebricola Jäch, 1986

Hydraena latisoror Perkins, 2007

Hydraena lazica Janssens, 1963

Hydraena leechi Perkins, 1980

Hydraena leei Jäch and Díaz, 1998

Hydraena lehmanni Jäch and Díaz, 2005

Hydraena leonhardi Breit, 1916

Hydraena leprieuri Sainte-Claire Deville, 1905

Hydraena levantina Sahlberg, 1908

Hydraena ligulipes Jäch, 1988

Hydraena limpidicollis Perkins, 1980

Hydraena liriope Orchymont, 1943

Hydraena longicollis Sharp, 1882

Hydraena lucasi Lagar, 1984

Hydraena lucernae Zwick, 1977

Hydraena ludovicae Orchymont, 1931

Hydraena luminicollis Perkins, 2007

Hydraena luridipennis MacLeay, 1873

Hydraena lusitana Berthélemy, 1977

Hydraena lycia Jäch, 1988

Hydraena macedonica Orchymont, 1931

Hydraena maculicollis Champion, 1920

Hydraena madronensis Castor, García and Ferreras, 2000

Hydraena magna Pu, 1951

Hydraena magnessa Jäch, 1997

Hydraena magnetica Zwick, 1977

Hydraena mahensis Scott, 1913

Hydraena malickyi Jäch, 1989

Hydraena malkini Perkins, 1980

Hydraena manaslu Skale and Jäch in Jäch and Skale, 2009

Hydraena manfredjaechi Delgado & Soler, 1991

Hydraena manguao Freitag and Jäch, 2007

Hydraena marcosae Aguilera, Hernando & Ribera, 1997

Hydraena marginicollis Kiesenwetter, 1849

Hydraena mariannae Jäch, 1992

Hydraena marinae Castro, 2003

Hydraena martensi Skale and Jäch in Jäch and Skale, 2009

Hydraena martinschoepfi Jäch and Díaz, 2005

Hydraena masatakai Jäch and Díaz, 2003

Hydraena maureenae Perkins, 1980

Hydraena mazamitla Perkins, 1980

Hydraena mecai Millán & Aguilera, 2000

Hydraena melas Dalla Torre, 1877

Hydraena meschniggi Pretner, 1929

Hydraena metzeni Perkins, 2007

Hydraena mexicana Perkins, 1980

Hydraena mignymixys Perkins, 1980

Hydraena millerorum Perkins, 2007

Hydraena miniretia Perkins, 2007

Hydraena minutissima Stephens, 1829

Hydraena mitchellensis Perkins, 2007

Hydraena miyatakei Satô, 1959

Hydraena modili Jäch, 1988

Hydraena monikae Jäch and Díaz, 2000

Hydraena monscassius Jäch, 1988

Hydraena monstruosipes Ferro, 1986

Hydraena monteithi Perkins, 2007

Hydraena morio Kiesenwetter, 1849

Hydraena mouzaiensis Sainte-Claire Deville, 1909

Hydraena muelleri Pretner, 1931

Hydraena muezziginea Jäch, 1988

Hydraena mylasae Jäch, 1992

Hydraena nelsonmandelai Makhan, 2008

Hydraena nevermanni Perkins, 1980

Hydraena newtoni Perkins, 1980

Hydraena nielshaggei Freitag and Jäch, 2007

Hydraena nigra Hatch, 1965

Hydraena nigrita Germar, 1824

Hydraena nike Jäch, 1995

Hydraena nilguenae Jäch, 1988

Hydraena nivalis Jäch, 1992

Hydraena notsui Satô, 1978

Hydraena numidica Sainte-Claire Deville, 1905

Hydraena nuratauensis Jäch, 1994

Hydraena oaxaca Perkins, 1980

Hydraena oblio Perkins, 1980

Hydraena occidentalis Perkins, 1980

Hydraena occitana Audisio & De Biase, 1995

Hydraena okinawensis Jäch and Díaz, 1999

Hydraena olidipastoris Jäch, 1988

Hydraena orchis Jäch and Díaz, 1998

Hydraena orcula Perkins, 1980

Hydraena ordishi Delgado and Palma, 1997

Hydraena orientalis Breit, 1916

Hydraena ortali Jäch, 1986

Hydraena orthosia Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006

Hydraena ovata Janssens, 1961

Hydraena oxiana Janssens, 1974

Hydraena ozarkensis Perkins, 1980

Hydraena pachyptera Apfelbeck, 1909

Hydraena pacifica Perkins, 1980

Hydraena paeminosa Perkins, 1980

Hydraena pagaluensis Hernando and Ribera, 2001

Hydraena paganettii Ganglbauer, 1901

Hydraena pakistanica Jäch, 1992

Hydraena palawanensis Freitag and Jäch, 2007

Hydraena pallidula Sainte-Claire Deville, 1909

Hydraena palustris Erichson, 1837

Hydraena pamirica Jäch, 1992

Hydraena pamphylia Jäch and Díaz, 2001

Hydraena pangaei Jäch, 1992

Hydraena paraguayensis Janssens, 1972

Hydraena parciplumea Perkins, 2007

Hydraena particeps Perkins, 1980

Hydraena parva Zwick, 1977

Hydraena parysatis Janssens, 1981

Hydraena paucistriata Jäch and Díaz, 2000

Hydraena pavicula Perkins, 1980

Hydraena pelops Jäch, 1995

Hydraena pensylvanica Kiesenwetter, 1849

Hydraena perkinsi Spangler, 1980

Hydraena perlonga Balfour-Browne, 1950

Hydraena persica Janssens, 1981

Hydraena peru Perkins, 1980

Hydraena petila Perkins, 1980

Hydraena phallerata Orchymont, 1944

Hydraena phallica Orchymont, 1930

Hydraena phassilyi Orchymont, 1931

Hydraena philippi Jäch and Díaz, 2005

Hydraena philyra Orchymont, 1944

Hydraena phoenicia Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006

Hydraena pici Sainte-Claire Deville, 1905

Hydraena pilipes Zwick, 1977

Hydraena pindica Janssens, 1965

Hydraena planata Kiesenwetter, 1849

Hydraena plastica Orchymont, 1943

Hydraena platycnemis Jäch, 1988

Hydraena platynaspis Jäch, 1988

Hydraena platysoma Janssens, 1968

Hydraena plaumanni Orchymont, 1937

Hydraena plumipes Rey, 1886

Hydraena plurifurcata Jäch and Díaz, 1998

Hydraena polita Kiesenwetter, 1849

Hydraena pontequula Perkins, 1980

Hydraena pontica Janssens, 1963

Hydraena porchi Perkins, 2007

Hydraena porcula Jäch and Díaz, 1998

Hydraena praetermissa Jäch, 1987

Hydraena premordica Perkins, 1980

Hydraena pretneri Chiesa, 1927

Hydraena prieto Perkins, 1980

Hydraena princeps Fauvel, 1903

Hydraena producta Mulsant & Rey, 1852

Hydraena prokini Jäch and Díaz, 2006

Hydraena prusensis Jäch, 1992

Hydraena pseudocirrata Skale and Jäch in Jäch and Skale, 2009

Hydraena pseudopalawanensis Freitag and Jäch, 2007

Hydraena pseudoriparia Orchymont, 1945

Hydraena puetzi Jäch, 1994

Hydraena pugillista Perkins, 2007

Hydraena pulchella Germar, 1824

Hydraena pulsatrix Perkins, 1980

Hydraena punctata LeConte, 1855

Hydraena puncticollis Sharp, 1882

Hydraena putearius Jäch and Díaz, 2000

Hydraena pygmaea Waterhouse, 1833

Hydraena quadrata Janssens, 1980

Hydraena quadricollis Wollaston, 1864

Hydraena quadricurvipes Perkins, 1980

Hydraena quechua Perkins, 1980

Hydraena queenslandica Perkins, 2007

Hydraena quetiae Castro, 2000

Hydraena quilisi Lagar, Fresneda and Fernando, 1987

Hydraena regimbarti Zaitzev, 1908

Hydraena reticulata Zwick, 1977

Hydraena reticuloides Perkins, 2007

Hydraena reticulositis Perkins, 2007

Hydraena revelovela Perkins, 2007

Hydraena reyi Kuwert, 1888

Hydraena rhinoceros Janssens, 1972

Hydraena rhodia Jäch, 1985

Hydraena riberai Jäch, Aguilera, and Hernando, 1998

Hydraena richardimbi Jäch, 1992

Hydraena rigua Orchymont, 1931

Hydraena ripaeaureae Janssens, 1972

Hydraena riparia Kugelann, 1794

Hydraena rivularis Guillebeau, 1896

Hydraena robusta Zwick, 1977

Hydraena rosannae Audisio, Trizzino and De Biase in Audio, Trizzino, De Biase, Mancini and Antonini, 2009

Hydraena rudallensis Blackburn, 1896

Hydraena rufipennis Boscá Berga, 1932

Hydraena rufipes Curtis, 1830

Hydraena rugosa Mulsant, 1844

Hydraena ruinosa Zwick, 1977

Hydraena rukiyeae Kasapoglu, Jäch and Skale, 2010

Hydraena sabella Perkins, 1980

Hydraena saga Orchymont, 1930

Hydraena sahlbergi Orchymont, 1923

Hydraena samia Jäch, 1986

Hydraena samnitica Knisch, 1924

Hydraena sanfilippoi Audisio & De Biase, 1995

Hydraena sappho Janssens, 1965

Hydraena sardoa Binaghi, 1961

Hydraena satoi Jäch and Díaz, 1999

Hydraena sautakei Jäch and Díaz, 1999

Hydraena sauteri Orchymont, 1913

Hydraena scabra Orchymont, 1925

Hydraena scabrosa Orchymont, 1931

Hydraena schawalleri Skale and Jäch in Jäch and Skale, 2009

Hydraena schilfii Jäch, 1988

Hydraena schillhammeri Jäch, 1988

Hydraena schmidi Jäch and Díaz, 2001

Hydraena schoedli Jäch, 1992

Hydraena schoenmanni Jäch, 1988

Hydraena schubertorum Jäch and Díaz, 2001

Hydraena schuelkei Jäch, 1992

Hydraena schuleri Ganglbauer, 1901

Hydraena scintilla Perkins, 1980

Hydraena scintillabella Perkins, 1980

Hydraena scintillutea Perkins, 1980

Hydraena scitula Orchymont, 1943

Hydraena scolops Perkins, 1980

Hydraena scopula Perkins, 1980

Hydraena scythica Janssens, 1974

Hydraena septemlacuum Jäch, 1992

Hydraena serpentina Jäch, 1988

Hydraena serricollis Wollaston, 1864

Hydraena servilia Orchymont, 1936

Hydraena sharmai Skale and Jäch in Jäch and Skale, 2009

Hydraena sharpi Rey, 1886

Hydraena sicula Kiesenwetter, 1849

Hydraena sidon Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006

Hydraena sierra Perkins, 1980

Hydraena similis Orchymont, 1930

Hydraena simonidea Orchymont, 1931

Hydraena simplicicollis Blackburn, 1896

Hydraena simplipes Zwick, 1977

Hydraena sinope Jäch, 1992

Hydraena smyrnensis Sahlberg, 1908

Hydraena socius Jäch and Díaz, 1999

Hydraena solarii Pretner, 1930

Hydraena solodovnikovi Jäch and Díaz, 2006

Hydraena sordida Sharp, 1882

Hydraena spangleri Perkins, 1980

Hydraena speciosa Orchymont, 1944

Hydraena spinipes Baudi, 1882

Hydraena spinissima Perkins, 2007

Hydraena splecoma Perkins, 1980

Hydraena squalida Orchymont, 1932

Hydraena stefani Jäch and Díaz, 2005

Hydraena storeyi Perkins, 2007

Hydraena stussineri Kuwert, 1888

Hydraena subacuminata Rey, 1884

Hydraena subgrandis Jäch, 1988

Hydraena subimpressa Rey, 1885

Hydraena subina Orchymont, 1944

Hydraena subinoides Orchymont, 1944

Hydraena subintegra Ganglbauer, 1901

Hydraena subinura Orchymont, 1944

Hydraena subirregularis Pic, 1918

Hydraena subjuncta Orchymont, 1930

Hydraena sublamina Orchymont, 1945

Hydraena sublapsa Orchymont, 1945

Hydraena subsequens Rey, 1886

Hydraena szechuanensis Pu, 1951

Hydraena takin Skale and Jäch in Jäch and Skale, 2009

Hydraena tarvisina Ferro, 1992

Hydraena tatii Sáinz-Cantero & Alba-Tercedor, 1989

Hydraena tauricola Jäch, 1988

Hydraena taxila Janssens, 1962

Hydraena tenjikuana Satô, 1979

Hydraena tenuis Janssens, 1980

Hydraena tenuisella Perkins, 2007

Hydraena tenuisoror Perkins, 2007

Hydraena terebrans Jäch, 1992

Hydraena terralta Perkins, 1980

Hydraena testacea Curtis, 1830

Hydraena textila Perkins, 2007

Hydraena thienemanni Orchymont, 1932

Hydraena thyene Balfour-Browne, 1958

Hydraena trapezoidalis Zwick, 1977

Hydraena tricantha Zwick, 1977

Hydraena tridisca Perkins, 2007

Hydraena triloba Perkins, 2007

Hydraena trinidensis Perkins, 1980

Hydraena triparamera Jäch, 1982

Hydraena truncata Rey, 1885

Hydraena tubuliphallis Jäch, 1982

Hydraena tucumanica Perkins, 1980

Hydraena tuolumne Perkins, 1980

Hydraena turcica Janssens, 1965

Hydraena turrialba Perkins, 1980

Hydraena tyrrhena Binaghi, 1961

Hydraena unca Valladares, 1989

Hydraena undevigintioctogintasisyphos Jäch and Díaz, 2005

Hydraena undulata Jäch and Díaz, 1998

Hydraena uzbekistanica Jäch, 1994

Hydraena vandykei Orchymont, 1923

Hydraena vedrasi Orchymont, 1931

Hydraena vela Perkins, 1980

Hydraena verberans Jäch and Díaz, 2006

Hydraena verstraeteni Ferro, 1984

Hydraena victoriae Jäch and Díaz, 1999

Hydraena vietnamensis Janssens, 1972

Hydraena virginalis Janssens, 1963

Hydraena vodozi Sainte-Claire Deville, 1908

Hydraena vulgaris Jäch and Díaz, 2000

Hydraena waldheimi Jäch, 1987

Hydraena wangi Jäch and Díaz, 1998

Hydraena wangmiaoi Jäch and Díaz, 2005

Hydraena watanabei Jäch and Satô, 1988

Hydraena wattsi Perkins, 2007

Hydraena weigeli Skale and Jäch in Jäch and Skale, 2009

Hydraena weiri Perkins, 2007

Hydraena wencke Skale and Jäch in Jäch and Skale, 2009

Hydraena wewalkai Jäch, 1988

Hydraena williamsensis Deane, 1931

Hydraena wittmeri Satô, 1979

Hydraena wolfi Skale and Jäch in Jäch and Skale, 2009

Hydraena wrasei Jäch, 1992

Hydraena yonaguniensis Jäch and Díaz, 2003

Hydraena yosemitensis Perkins, 1980

Hydraena yoshitomii Jäch and Díaz, 1999

Hydraena youngi Perkins, 1980

Hydraena ypsilon Zwick, 1977

Hydraena yunnanensis Pu, 1942

Hydraena zapatina Perkins, 1980

Hydraena zelandica Ordish, 1984

Hydraena zetteli Freitag and Jäch, 2007

Hydraena zezerensis Díaz Pazos & Bilton, 1995

Hydraena zwicki Perkins, 2007