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| Kingdom Animalia |
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Hydraena akbesiana Audisio, De Biase and Jäch, 1993 -- valid |
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Hydraena alpicola Pretner, 1931 -- valid |
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Hydraena altamirensis Díaz Pazos and Garrido Gonzalez, 1993 -- valid |
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Hydraena anatolica Janssens, 1963 -- valid |
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Hydraena aroensis (Ferro, 1991) -- valid |
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Hydraena belgica Orchymont, 1930 -- valid |
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Hydraena bensae Ganglbauer, 1901 -- valid |
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Hydraena berthelemyana Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006 -- valid |
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Hydraena bicuspidata Ganglbauer, 1901 -- valid |
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Hydraena bitruncata Orchymont, 1934 -- valid |
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Hydraena bononiensis Binaghi, 1960 -- valid |
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Hydraena bosnica Apfelbeck, 1909 -- valid |
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Hydraena carniolica Pretner, 1970 -- valid |
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Hydraena cata Orchymont, 1936 -- valid |
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Hydraena catalonica Fresneda, Aguilera and Hernando, 1994 -- valid |
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Hydraena caucasica Kuwert, 1888 -- valid |
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Hydraena christinae Audisio, De Biase and Jäch, 1996 -- valid |
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Hydraena crepidoptera Jäch, 1992 -- valid |
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Hydraena czernohorskyi Müller, 1911 -- valid |
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Hydraena dalmatina Ganglbauer, 1901 -- valid |
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Hydraena decolor Sainte-Claire Deville, 1903 -- valid |
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Hydraena dentipes Germar, 1824 -- valid |
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Hydraena devillei Ganglbauer, 1901 -- valid |
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Hydraena devincta Orchymont, 1940 -- valid |
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Hydraena diazi Trizzino, Jäch and Ribera in Trizzino, Jäch, Audisio and Rivera, 2011 -- valid |
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Hydraena discreta Ganglbauer, 1904 -- valid |
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Hydraena elisabethae Jäch, 1992 -- valid |
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Hydraena emarginata Rey, 1885 -- valid |
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Hydraena epeirosi Ferro, 1985 -- valid |
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Hydraena evanescens Rey, 1884 -- valid |
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Hydraena exasperata Orchymont, 1935 -- valid |
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Hydraena excisa Kiesenwetter, 1849 -- valid |
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Hydraena fontiscarsavii (Jäch, 1988) -- valid |
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Hydraena fosterorum Trizzino, Jäch and Ribera in Trizzino, Jäch, Audisio and Rivera, 2011 -- valid |
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Hydraena gaditana Lagar and Fresneda, 1990 -- valid |
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Hydraena gracilidelphis Trizzino, Valladares, Garrido and Audisio, 2012 -- valid |
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Hydraena gracilis Germar, 1824 -- valid |
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Hydraena graciloides (Jäch, 1988) -- valid |
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Hydraena gynaephila Jäch, 1997 -- valid |
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Hydraena heterogyna Bedel, 1898 -- valid |
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Hydraena hispanica Ganglbauer, 1901 -- valid |
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Hydraena hosseinieorum Bilton and Jäch, 1998 -- valid |
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Hydraena hungarica Rey, 1884 -- valid |
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Hydraena iberica Orchymont, 1936 -- valid |
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Hydraena integra Pretner, 1931 -- valid |
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Hydraena jaechiana (Audisio and De Biase, 1990) -- valid |
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Hydraena khnzoriani Janssens, 1968 -- valid |
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Hydraena krasnodarensis Jäch and Díaz, 2006 -- valid |
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Hydraena lapidicola Kiesenwetter, 1849 -- valid |
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Hydraena larissae Jäch and Díaz, 2000 -- valid |
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Hydraena lazica Janssens, 1963 -- valid |
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Hydraena leonhardi Breit, 1916 -- valid |
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Hydraena lusitana (Berthélemy in Berthélemy and Whytton Da Terra, 1977) -- valid |
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Hydraena madronensis Castor, García and Ferreras, 2000 -- valid |
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Hydraena magnessa Jäch, 1997 -- valid |
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Hydraena manfredjaechi Delgado and Soler, 1991 -- valid |
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Hydraena monstruosipes Ferro, 1986 -- valid |
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Hydraena muelleri Pretner, 1931 -- valid |
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Hydraena nike Jäch, 1995 -- valid |
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Hydraena nilguenae (Jäch, 1988) -- valid |
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Hydraena occitana (Audisio and De Biase, 1995) -- valid |
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Hydraena orthosia Jäch, Díaz and Dia in Jäch, Dia and Díaz, 2006 -- valid |
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Hydraena pangaei Jäch, 1992 -- valid |
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Hydraena pelops Jäch, 1995 -- valid |
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Hydraena phallica Orchymont, 1930 -- valid |
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Hydraena planata Kiesenwetter, 1849 -- valid |
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Hydraena plastica Orchymont, 1943 -- valid |
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Hydraena plumipes Rey, 1886 -- valid |
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Hydraena polita Kiesenwetter, 1849 -- valid |
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Hydraena producta Mulsant and Rey, 1852 -- valid |
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Hydraena prokini Jäch and Díaz, 2006 -- valid |
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Hydraena rosannae Audisio, Trizzino and De Biase in Audisio, Trizzino, De Biase, Mancini and Antonini, 2009 -- valid |
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Hydraena saga Orchymont, 1930 -- valid |
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Hydraena samnitica Knisch, 1924 -- valid |
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Hydraena sanfilippoi (Audisio and De Biase, 1995) -- valid |
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Hydraena sappho Janssens, 1965 -- valid |
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Hydraena schuleri Ganglbauer, 1901 -- valid |
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Hydraena scitula Orchymont, 1943 -- valid |
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Hydraena septemlacuum Jäch, 1992 -- valid |
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Hydraena sinope Jäch, 1992 -- valid |
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Hydraena solarii Pretner, 1930 -- valid |
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Hydraena solodovnikovi Jäch and Díaz, 2006 -- valid |
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Hydraena subintegra Ganglbauer, 1901 -- valid |
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Hydraena tarvisina (Ferro, 1992) -- valid |
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Hydraena tatii Sáinz-Cantero and Alba-Tercedor, 1989 -- valid |
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Hydraena truncata Rey, 1885 -- valid |
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Hydraena tyrrhena Binaghi, 1961 -- valid |
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Hydraena vedrasi Orchymont, 1931 -- valid |
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Hydraena zezerensis Díaz Pazos and Bilton, 1995 -- valid |
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