Aquatic Coleoptera of North Oman, with description of new species of Hydraenidae and Hydrophilidae Author Ribera, Ignacio Institute of Evolutionary Biology (CSIC-Universitat Pompeu Fabra), Passeig Maritim de la Barceloneta 37, E- 08003 Barcelona, Spain; Author Hernando, Carles P. O. box 118, E- 08911 Badalona, Catalonia, Spain; e-mail: leptotyphlus @ gmail. com Author Cieslak, Alexandra Institute of Evolutionary Biology (CSIC-Universitat Pompeu Fabra), Passeig Maritim de la Barceloneta 37, E- 08003 Barcelona, Spain; text Acta Entomologica Musei Nationalis Pragae 2019 2019-06-24 59 1 253 272 journal article 8140 10.2478/aemnp-2019-0021 726682f3-9eac-4961-ac4d-d8b8679e8211 1804-6487 4488950 ABBA2B4F-8B60-41E2-B80B-45861F974B23 Hydraena ( Hydraena ) gattolliati Jäch & Delgado, 2010 Material examined. Loc. 4: 1 ♁. Notes. New record for Oman . The species was described from the wadi Wurayah, in the northeastern UAE , which is also the type locality of Ochthebius wuraya Jäch & Delgado, 2010 . A third species of Hydraenidae was found in the same locality, Hydraena putearius Jäch & Díaz, 2000 ( JÄCH & DELGADO 2010 ). It is remarkable that the same three species were found in our locality 4 ( Figs 5, 6 ), but with the addition of three new species, one Hydraena and two Ochthebius (see below).