Gerromorpha Popov, 1971 see Infraorder Gerromorpha Popov, 1971 Family Hydrometridae (Billberg, 1820) Subfamily Hydrometrinae (Billberg, 1820) Esaki, 1927 Genus Hydrometra Latreille, 1796 1 Hydrometra hungerfordi Torre-Bueno, 1926 2 Hydrometra martini Kirkaldy, 1900