title: Hydraena
text: Hydraena zijn een geslacht  van kevers uit de familie van de waterkruipers (Hydraenidae). Ruim 900 soorten zijn bij het geslacht ingedeeld.
  
  Taxonomie 
  O.a. de volgende soorten zijn bij het geslacht ingedeeld:
   Hydraena abbasigili Jäch, 1988
   Hydraena abdita Orchymont, 1948
   Hydraena abyssinica Régimbart, 1905
   Hydraena accurata Orchymont, 1948
   Hydraena achaica Jäch, 1995
   Hydraena acumena Perkins, 2011
   Hydraena adelbertensis Perkins, 2011
   Hydraena adrastea Orchymont, 1948
   Hydraena aethaliensis Breit, 1917
   Hydraena affirmata Perkins, 2007
   Hydraena affusa Orchymont, 1936
   Hydraena africana Kuwert, 1888
   Hydraena akameku Perkins, 2011
   Hydraena akbesiana Audisio, De Biase & 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 & Garrido Gonzalez, 1993
   Hydraena altapapua Perkins, 2011
   Hydraena alternata Perkins, 1980
   Hydraena alterra Perkins, 1980
   Hydraena alticola Skale and Jäch, 2008
   Hydraena altiphila Perkins, 2011
   Hydraena amazonica Perkins, 2011
   Hydraena ambiflagellata Zwick, 1977
   Hydraena ambigua Ganglbauer 1901
   Hydraena ambiosina Perkins, 2007
   Hydraena ambra Perkins, 2011
   Hydraena ambripes Perkins, 2011
   Hydraena ambroides Perkins, 2011
   Hydraena americana Jäch, 1993
   Hydraena amidensis Jäch, 1988
   Hydraena ampla Perkins, 2011
   Hydraena anaphora Perkins, 1980
   Hydraena anatolica Janssens, 1963
   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 apertista Perkins, 2011
   Hydraena apexa Perkins, 2011
   Hydraena appalachicola Perkins, 1980
   Hydraena appetita Perkins, 2007
   Hydraena aquila Perkins, 2011
   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 aroensis (Ferro, 1991) stat. nov. 
   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 atroscintilla Perkins, 2011
   Hydraena attaleiae Ferro, 1984
   Hydraena audisioi Jäch, 1992
   Hydraena aulaarta Perkins, 2011
   Hydraena aurita Jäch, 1988
   Hydraena australica Zwick, 1977
   Hydraena australula Perkins, 2007
   Hydraena austrobesa Perkins, 2011
   Hydraena avuncula Jäch, 1988
   Hydraena bacchusi Perkins, 2011
   Hydraena bactriana Janssens, 1962
   Hydraena balearica Orchymont, 1930
   Hydraena balfourbrownei Bameul, 1986
   Hydraena balkei Perkins, 2011
   Hydraena balli Orchymont, 1940
   Hydraena barbipes Zwick, 1977
   Hydraena barricula Perkins, 1980
   Hydraena barrosi Orchymont, 1934
   Hydraena bedeli Barthélemy, 1992
   Hydraena belgica d’Orchymont, 1930
   Hydraena beniensis Perkins, 2011
   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 bicarinova Perkins, 2011
   Hydraena bicolorata Jäch, 1997
   Hydraena bicuspidata Ganglbauer 1901
   Hydraena bicuspidata Ganglbauer, 1901
   Hydraena bidefensa Perkins, 2007
   Hydraena bifunda Perkins, 2011
   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 d’Orchymont, 1934
   Hydraena bituberculata Perkins, 1980
   Hydraena biundulata Perkins, 2011
   Hydraena blackburni Zaitzev, 1908
   Hydraena bodemeyeri Jäch and Díaz, 2001
   Hydraena boetcheri Orchymont, 1932
   Hydraena bolivari Orchymont, 1936
   Hydraena boliviana Perkins, 2011
   Hydraena bononiensis Binaghi, 1960
   Hydraena bononiensis Chiesa, 1959
   Hydraena borbonica Fairmaire, 1898
   Hydraena bosnica Apfelbeck, 1909
   Hydraena brachymera Orchymont, 1936
   Hydraena bractea Perkins, 1980
   Hydraena bractoides Perkins, 1980
   Hydraena brahmin Perkins, 2011
   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 bubulla Perkins, 2011
   Hydraena bulgarica Breit, 1916
   Hydraena buloba Perkins, 2011
   Hydraena buquintana Perkins, 2011
   Hydraena buscintilla Perkins, 2011
   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 carinocisiva Perkins, 2011
   Hydraena carinulata Rey, 1886
   Hydraena carmellita Perkins, 2011
   Hydraena carniolica Pretner, 1970
   Hydraena castanea Deane, 1937
   Hydraena castanescens Freitag and Jäch, 2007
   Hydraena cata d’Orchymont, 1936
   Hydraena cata Orchymont, 1943
   Hydraena catalonica Fresneda, Aguilera & Hernando, 1994
   Hydraena catherinae Bameul and Jäch, 2001
   Hydraena caucasica Kuwert, 1888
   Hydraena cavifrons Perkins, 2011
   Hydraena cephalleniaca Jäch, 1985
   Hydraena cervisophila Jäch, 1992
   Hydraena challeti Perkins, 2011
   Hydraena cheesmanae Perkins, 2011
   Hydraena chenae Pu 1951
   Hydraena chersonesica Jäch, Díaz and Przewozny, 2007
   Hydraena cherylbarrae Perkins, 2011
   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 clarinis Perkins, 2011
   Hydraena claudia Freitag and Jäch, 2007
   Hydraena clavigera Zwick, 1977
   Hydraena clemens Jäch and Díaz, 2006
   Hydraena clinodorsa Perkins, 2011
   Hydraena clystera Perkins, 2011
   Hydraena cochabamba Perkins, 2011
   Hydraena colchica Janssens, 1963
   Hydraena colombiana Perkins, 1980
   Hydraena colorata Perkins, 2011
   Hydraena colymba Perkins, 1980
   Hydraena compressipilis Jäch and Díaz, 1998
   Hydraena concepcionica Perkins, 2011
   Hydraena concinna Orchymont, 1932
   Hydraena confluenta Perkins, 2011
   Hydraena confusa Pu, 1951
   Hydraena connexa Orchymont, 1932
   Hydraena converga Perkins, 2007
   Hydraena coomani Orchymont, 1932
   Hydraena cooperi Balfour-Browne, 1954
   Hydraena copulata Perkins, 2011
   Hydraena cordata Schaufuss, 1883
   Hydraena cordiformis Jäch and Díaz, 2000
   Hydraena cordispina Perkins, 2011
   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 cunicula Perkins, 2011
   Hydraena cunninghamensis Perkins, 2007
   Hydraena curta Kiesenwetter, 1849
   Hydraena curtipalpis Jäch and Díaz, 1998
   Hydraena curvosa Perkins, 2011
   Hydraena cuspidicollis Perkins, 1980
   Hydraena cyclops Jäch and Díaz, 2000
   Hydraena cygnus Zwick, 1977
   Hydraena czernohorskyi J. Müller, 1911
   Hydraena d-concava Perkins, 2011
   Hydraena dalmatina Ganglbauer, 1901
   Hydraena damascena Pic, 1910
   Hydraena dariensis Perkins, 2011
   Hydraena darwini Perkins, 2007
   Hydraena d-destina Perkins, 1980
   Hydraena debeckeri (Janssens, 1972)
   Hydraena decepta Perkins, 2011
   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, 1824
   Hydraena dentipes Germar, 1842
   Hydraena devillei Ganglbauer, 1901
   Hydraena devincta d’Orchymont, 1940
   Hydraena diadema Perkins, 2011
   Hydraena diazi Trizzino, Jäch & Ribera, 2011
   Hydraena diffusa Perkins, 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 dudgeoni Perkins, 2011
   Hydraena duohamata Perkins, 2011
   Hydraena ebriimadli Jäch, 1988
   Hydraena ecuadormica Perkins, 2011
   Hydraena egoni Jäch, 1986
   Hydraena eichleri Orchymont 1937
   Hydraena einsteini Perkins, 2011
   Hydraena elisabethae Jäch, 1992
   Hydraena eliya Jäch, 1982
   Hydraena emarginata Rey, 1885
   Hydraena emineae Jäch and Kasapoglu, 2006
   Hydraena epeirosi Ferro, 1985
   Hydraena errina Orchymont, 1948
   Hydraena erythraea Régimbart, 1905
   Hydraena eryx Orchymont, 1948
   Hydraena essentia Perkins, 2011
   Hydraena eucnemis Janssens, 1970
   Hydraena evanescens Rey, 1884
   Hydraena evansi Balfour-Browne, 1945
   Hydraena exarata Kiesenwetter, 1866
   Hydraena exasperata d’Orchymont, 1935
   Hydraena excisa Kiesenwetter, 1849
   Hydraena exhalista Perkins, 2011
   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 fasciata Perkins, 2011
   Hydraena fascinata <Perkins, 2011
   Hydraena fasciola Perkins, 2011
   Hydraena fasciolata Perkins, 2011
   Hydraena fasciopaca Perkins, 2011
   Hydraena fenestella Perkins, 2011
   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 flagella Perkins, 2011
   Hydraena fluvicola (Perkins, 1980)
   Hydraena foliobba Perkins, 2011
   Hydraena fontana Orchymont, 1932
   Hydraena fontiscarsavii (Jäch, 1988)
   Hydraena formosopala Perkins, 2011
   Hydraena formula Orchymont, 1932
   Hydraena forticollis Perkins, 2007
   Hydraena fosterorum Trizzino, Jäch & 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 funda Perkins, 2011
   Hydraena fundacta Perkins, 2011
   Hydraena fundaequalis Perkins, 2007
   Hydraena fundapta Perkins, 2011
   Hydraena fundarca Perkins, 2011
   Hydraena fundata Perkins, 2007
   Hydraena fundextra Perkins, 2011
   Hydraena furthi Jäch, 1982
   Hydraena gaditana Lagar & Fresneda, 1990
   Hydraena galatica Janssens, 1970
   Hydraena galea Perkins, 2011
   Hydraena gattolliati 
   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 gracilidelphis Trizzino, Valladares, Garrido & Audisio, 2012
   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 Jäch, 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 herzogestella Perkins, 2011
   Hydraena heterogyna Bedel 
   Hydraena hiekei Jäch, 1992
   Hydraena hillaryi Skale and Jäch in Jäch and Skale, 2009
   Hydraena hintoni Perkins, 2011
   Hydraena hispanica Ganglbauer, 1901
   Hydraena holdhausi Pretner, 1929
   Hydraena hornabrooki Perkins, 2011
   Hydraena hortensis Jäch & Díaz, 2000
   Hydraena hosiwergi Freitag and Jäch, 2007
   Hydraena hosseinieorum Bilton & Jäch, 1998
   Hydraena huangshanensis Jäch and Díaz, 2005
   Hydraena huitongensis Jäch and Díaz, 2005
   Hydraena hunanensis Pu, 1951
   Hydraena hungarica Rey, 1884
   Hydraena huonica Perkins, 2011
   Hydraena hyalina Perkins, 1980
   Hydraena hynesi Zwick, 1977
   Hydraena hypipamee Perkins, 2007
   Hydraena ibalimi Perkins, 2011
   Hydraena iberica d’Orchymont, 1936
   Hydraena idema Perkins, 2011
   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 impala Perkins, 2011
   Hydraena imperatrix Kniz, 1919
   Hydraena impercepta Zwick, 1977
   Hydraena impressicollis Fairmaire, 1898
   Hydraena inancala Perkins, 2007
   Hydraena inapicipalpis Pic, 1918
   Hydraena incisiva Perkins, 2011
   Hydraena incista Perkins, 2011
   Hydraena incurva Orchymont, 1932
   Hydraena indiana Jäch, 1994
   Hydraena indica Orchymont, 1920
   Hydraena infoveola Perkins, 2011
   Hydraena ingens (Perkins, 1980)
   Hydraena inhalista Perkins, 2011
   Hydraena innuda Perkins, 2007
   Hydraena inopinata Jäch and Díaz, 1998
   Hydraena inplacopaca Perkins, 2011
   Hydraena insandalia Perkins, 2011
   Hydraena insita Orchymont, 1932
   Hydraena insolita Orchymont, 1932
   Hydraena insularis Orchymont, 1945
   Hydraena integra Pretner, 1931
   Hydraena intensa Perkins, 2011
   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 johncoltranei Perkins, 2011
   Hydraena jubilata Perkins, 2011
   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 kellymilleri Perkins, 2011
   Hydraena khnzoriani Janssens, 1968
   Hydraena kilimandjarensis Régimbart, 1906
   Hydraena knischi Orchymont, 1928
   Hydraena kocheri Berthélemy, 1992
   Hydraena kodadai Freitag and Jäch, 2007
   Hydraena koje Perkins, 2011
   Hydraena koma Perkins, 2011
   Hydraena krasnodarensis Jäch & Díaz, 2006
   Hydraena kroumiriana Kaddouri, 1992
   Hydraena kucinici 
   Hydraena kuehnelti Jäch, 1989
   Hydraena kurdistanica Jäch, 1988
   Hydraena kwangsiensis Pu, 1951
   Hydraena labropaca Perkins, 2011
   Hydraena lapidicola Kiesenwetter, 1849
   Hydraena lapissectilis Jäch, 1992
   Hydraena larissae Jäch & Díaz, 2000
   Hydraena larsoni Perkins, 2007
   Hydraena lassulipes Perkins, 2011
   Hydraena latebricola Jäch, 1986
   Hydraena latisoror Perkins, 2007
   Hydraena lazica Janssens, 1963
   Hydraena leechi Perkins, 1980
   Hydraena leei Jäch and Díaz, 1998
   Hydraena legorskyi 
   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 lilianae Perkins, 2011
   Hydraena limbobesa Perkins, 2011
   Hydraena limpidicollis Perkins, 1980
   Hydraena liriope Orchymont, 1943
   Hydraena longicollis Sharp 1882
   Hydraena loripes Perkins, 2011
   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 maculopala Perkins, 2011
   Hydraena madronensis Castro, Garcia & 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 manabica Perkins, 2011
   Hydraena manaslu Skale and Jäch in Jäch and Skale, 2009
   Hydraena manfredjaechi Delgado & Soler, 1991
   Hydraena manguao Freitag and Jäch, 2007
   Hydraena manulea Perkins, 2011
   Hydraena manuloides Perkins, 2011
   Hydraena marawaka Perkins, 2011
   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 mauriciogarciai Perkins, 2011
   Hydraena mazamitla Perkins, 1980
   Hydraena mecai Millán & Aguilera, 2000
   Hydraena melas Dalla Torre 1877
   Hydraena mercuriala Perkins, 2011
   Hydraena meschniggi Pretner, 1929
   Hydraena metzeni Perkins, 2007
   Hydraena mexicana Perkins, 1980
   Hydraena mianminica Perkins, 2011
   Hydraena mignymixys Perkins, 1980
   Hydraena millerorum Perkins, 2007
   Hydraena miniretia Perkins, 2007
   Hydraena mintrita Perkins, 2011
   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 multiloba Perkins, 2011
   Hydraena multispina Perkins, 2011
   Hydraena mylasae Jäch, 1992
   Hydraena nanocolorata Perkins, 2011
   Hydraena nanopala Perkins, 2011
   Hydraena nanoscintilla Perkins, 2011
   Hydraena neblina Perkins, 2011
   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 nitidimenta Perkins, 2011
   Hydraena nivalis Jäch, 1992
   Hydraena notsui Sato, 1978
   Hydraena novacula Perkins, 2011
   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 okapa Perkins, 2011
   Hydraena okinawensis Jäch and Díaz, 1999
   Hydraena olidipastoris Jäch, 1988
   Hydraena ollopa Perkins, 2011
   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 otiarca Perkins, 2011
   Hydraena ovata Janssens, 1961
   Hydraena owenobesa Perkins, 2011
   Hydraena oxiana Janssens, 1974
   Hydraena ozarkensis Perkins, 1980
   Hydraena pachyptera Apfelbeck, 1909
   Hydraena pacifica Perkins, 1980
   Hydraena pacificica Perkins, 2011
   Hydraena paeminosa Perkins, 1980
   Hydraena pagaluensis Hernando and Ribera, 2001
   Hydraena paganettii Ganglbauer, 1901
   Hydraena pakistanica Jäch, 1992
   Hydraena pala Perkins, 2011
   Hydraena palamita Perkins, 2011
   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 pantanalensis Perkins, 2011
   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 paxillipes Perkins, 2011
   Hydraena peckorum Perkins, 2011
   Hydraena pectenata Perkins, 2011
   Hydraena pedroaguilerai Perkins, 2011
   Hydraena pegopyga Perkins, 2011
   Hydraena pelops Jäch, 1995
   Hydraena pensylvanica Kiesenwetter 1849
   Hydraena penultimata Perkins, 2011
   Hydraena perkinsi Spangler, 1980
   Hydraena perlonga Balfour-Browne, 1950
   Hydraena perpunctata Perkins, 2011
   Hydraena persica Janssens, 1981
   Hydraena pertransversa Perkins, 2011
   Hydraena peru Perkins, 1980
   Hydraena petila Perkins, 1980
   Hydraena phainops Perkins, 2011
   Hydraena phallerata Orchymont 1944
   Hydraena phallica d’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 photogenica Perkins, 2011
   Hydraena pici Sainte-Claire Deville, 1905
   Hydraena picula Perkins, 2011
   Hydraena pilipes Zwick, 1977
   Hydraena pilulambra Perkins, 2011
   Hydraena pindica Janssens, 1965
   Hydraena planata Kiesenwetter, 1849
   Hydraena planata Kiesenwetter, 1849
   Hydraena plastica d’Orchymont, 1943
   Hydraena platycnemis Jäch, 1988
   Hydraena platynaspis Jäch, 1988
   Hydraena platysoma Janssens, 1968
   Hydraena plaumanni Orchymont, 1937
   Hydraena plumipes Rey 1886
   Hydraena pluralticola Perkins, 2011
   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 processa Perkins, 2011
   Hydraena producta Mulsant & Rey, 1852
   Hydraena prokini Jäch & Díaz, 2006
   Hydraena propria Perkins, 2011
   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 punctilata Perkins, 2011
   Hydraena putearius Jäch and Díaz, 2000
   Hydraena pygmaea Waterhouse, 1833
   Hydraena quadrata (Janssens, 1980)
   Hydraena quadricollis Wollaston 1864
   Hydraena quadricurvipes Perkins, 1980
   Hydraena quadriplumipes Perkins, 2011
   Hydraena quechua Perkins, 1980
   Hydraena queenslandica Perkins, 2007
   Hydraena quetiae Castro, 2000
   Hydraena quilisi Lagar, Fresneda and Fernando, 1987
   Hydraena quintana Perkins, 2011
   Hydraena ramuensis Perkins, 2011
   Hydraena ramuquintana Perkins, 2011
   Hydraena receptiva Perkins, 2011
   Hydraena regimbarti Zaitzev, 1908
   Hydraena remulipes Perkins, 2011
   Hydraena reticulata Zwick, 1977
   Hydraena reticulobesa Perkins, 2011
   Hydraena reticuloides Perkins, 2007
   Hydraena reticulositis Perkins, 2007
   Hydraena revelovela Perkins, 2007
   Hydraena reverberata Perkins, 2011
   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 d’Orchymont, 1930
   Hydraena sagatai Perkins, 2011
   Hydraena sahlbergi Orchymont, 1923
   Hydraena saluta Perkins, 2011
   Hydraena samia Jäch, 1986
   Hydraena samnitica Fiori, 1904
   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 schuleri Ganglbauer, 1901
   Hydraena scintilla Perkins, 1980
   Hydraena scintillabella Perkins, 1980
   Hydraena scintillamima Perkins, 2011
   Hydraena scintillapicta Perkins, 2011
   Hydraena scintillarca Perkins, 2011
   Hydraena scintillutea Perkins, 1980
   Hydraena scitula d’Orchymont, 1943
   Hydraena scolops Perkins, 1980
   Hydraena scopula Perkins, 1980
   Hydraena scythica Janssens, 1974
   Hydraena sepikramuensis Perkins, 2011
   Hydraena septemlacuum Jäch, 1992
   Hydraena serpentina Jäch, 1988
   Hydraena serricollis Wollaston, 1864
   Hydraena servilia Orchymont, 1936
   Hydraena sexarcuata Perkins, 2011
   Hydraena sexsuprema Perkins, 2011
   Hydraena sharmai Skale and Jäch in Jäch and Skale, 2009
   Hydraena sharpi Rey, 1886
   Hydraena shorti Perkins, 2011
   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 & Díaz, 2006
   Hydraena sordida Sharp 1882
   Hydraena spangleri Perkins, 1980
   Hydraena spatula Perkins, 2011
   Hydraena speciosa Orchymont, 1944
   Hydraena spinipes Baudi, 1882
   Hydraena spinissima Perkins, 2007
   Hydraena spinobesa Perkins, 2011
   Hydraena splecoma Perkins, 1980
   Hydraena squalida Orchymont, 1932
   Hydraena stefani Jäch and Díaz, 2005
   Hydraena steineri Perkins, 2011
   Hydraena stellula Perkins, 2011
   Hydraena storeyi Perkins, 2007
   Hydraena striolata Perkins, 2011
   Hydraena stussineri Kuwert, 1888
   Hydraena subacuminata Rey, 1884
   Hydraena subgrandis Jäch, 1988
   Hydraena subimpressa Rey 1885
   Hydraena subina Orchymont, 1944
   Hydraena subinflata 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 supersexa Perkins, 2011
   Hydraena supina Perkins, 2011
   Hydraena szechuanensis Pu, 1951
   Hydraena takin Skale and Jäch in Jäch and Skale, 2009
   Hydraena takutu Perkins, 2011
   Hydraena tarsotricha Perkins, 2011
   Hydraena tarvisina (Ferro, 1991)
   Hydraena tatii Sáinz-Cantero & Alba-Tercedor, 1989
   Hydraena tauricola Jäch, 1988
   Hydraena taxila Janssens, 1962
   Hydraena tekmanensis 
   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 tetana Perkins, 2011
   Hydraena textila Perkins, 2007
   Hydraena thienemanni Orchymont, 1932
   Hydraena thola Perkins, 2011
   Hydraena tholasoris Perkins, 2011
   Hydraena thumbelina Perkins, 2011
   Hydraena thumbelipes Perkins, 2011
   Hydraena thyene Balfour-Browne, 1958
   Hydraena tibiopaca Perkins, 2011
   Hydraena tobogan Perkins, 2011
   Hydraena torosopala Perkins, 2011
   Hydraena torricellica Perkins, 2011
   Hydraena transvallis Perkins, 2011
   Hydraena trapezoidalis Zwick, 1977
   Hydraena tricantha Zwick, 1977
   Hydraena trichotarsa Perkins, 2011
   Hydraena tricosipes Perkins, 2011
   Hydraena tridigita Perkins, 2011
   Hydraena tridisca Perkins, 2007
   Hydraena triloba Perkins, 2007
   Hydraena trinidensis Perkins, 1980
   Hydraena triparamera Jäch, 1982
   Hydraena tritropis Perkins, 2011
   Hydraena tritutela Perkins, 2011
   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 ulna Perkins, 2011
   Hydraena umbolenta Perkins, 2011
   Hydraena unca Valladares, 1989
   Hydraena undevigintioctogintasisyphos Jäch and Díaz, 2005
   Hydraena undulata Jäch and Díaz, 1998
   Hydraena unita Perkins, 2011
   Hydraena uzbekistanica Jäch, 1994
   Hydraena vandykei Orchymont, 1923
   Hydraena variopaca Perkins, 2011
   Hydraena vedrasi d’Orchymont, 1931
   Hydraena vela Perkins, 1980
   Hydraena velvetina Perkins, 2011
   Hydraena venezuela Perkins, 2011
   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 xingu Perkins, 2011
   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 
  
  Waterkruipers