Hydraena

***Hydraena*** er en slekt av biller som lever i og ved ferskvann. De er små biller som kan kjennes på at maksillarpalpene (munnfølerne) er svært lange.

## Utseende
Små biller (1 – 3&nbsp;mm), brystskjoldet og dekkvingene tydelig skilt ved en innskjæring. Hodet er bredt med små, runde fasettøyne. Antennene består av ni til elleve ledd, med en svakt definert, fire- eller fem-leddet kølle. Palpene (munnfølerne) er mye lengre enn antennene. Brystskjoldet (pronotum) er kantete med tydelige groper eller lengdefurer. Dekkvingene har tydelige punktrekker. Beina er forholdsvis korte med fire-leddete føtter. **Larvene** er lange og slanke, med tre par korte bein og en hodekapsel med forholdsvis lange antenner og små kjever.

## Levevis
Palpebillene lever i eller ved vann. De forskjellige artene finnes stort sett enten i stillestående eller rennende vann, sjelden begge deler, og holder seg i vegetasjon eller mudder nær bredden, også på land ved vannkanten. Artene i slekten *Hydraena* foretrekker stort sett rent og klart vann, og kan være gode indikatorer på lite forurensning. De voksne billene er planteetere, larvene rovdyr.

## Systematisk inndeling

* Ordenen biller, **Coleoptera**
** Underordenen Polyphaga
*** Overfamilien åtsel- og rovbiller, **Staphylinoidea** (litt usikker plassering)
**** Familien **[[palpebiller]]**, **[[Hydraenidae]]**
***** Underfamilien Bekkepalpebiler, **[[Hydraeninae]]**
****** Stammen Hydraenini
******* Slekten ***Hydraena*** Kugelann, 1794  – omtrent 400 arter på verdensbasis. I Norge:
******** ***[[Hydraena britteni]]*** Joy, 1907  – trolig den vanligste arten
******** ***[[Hydraena gracilis]]*** Germar, 1824
******** ***[[Hydraena nigrita]]*** Germar, 1824
******** ***[[Hydraena palustris]]*** Erichson, 1837
******** ***[[Hydraena riparia]]*** Kugelann, 1794
### Liste over arter som ikke forekommer i Norge

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

## Kilder
* Hansen, M. 1987. The Hydrophiloidea (Coleoptera) of Fennoscandia and Denmark. *Fauna Entomologica Scandinavica* 18. E.J.Brill / Scandinavian Science Press Ltd.
## Eksterne lenker
*