Taxonomy of Ecuadorian water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae) Author Perkins, Philip D. text Zootaxa 2020 2020-06-11 4790 2 358 374 journal article 21707 10.11646/zootaxa.4790.2.10 3f492afe-37c4-4bc9-b7d1-5f8d804cf5bb 1175-5326 3889408 7F4A9B99-C12E-473B-B258-7BE5697F4986 Hydrochus bituberculatus Perkins Hydrochus bituberculatus Perkins 2019c: 11 Originally described from Venezuela , the following specimen records are from Ecuador . Images of the holotype habitus and male genitalia are given in Perkins (2019c) . Material examined (2): Ecuador : Napo , Limoncocha, on Rio Napo , elev. 300 m , 10.iv.1974 , leg. Boyce A. Drummond , III (1 NMNH ); Stanta Cecilia , ( 0°2’N , 76°58’W ), 25-31.iii.1969 , leg. P. & P. Spangler (1 NMNH ) .