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 Laccobius ( Microlaccobius ) praecipuus Kuwert, 1890 Published records. HEBAUER (1997) . Material examined. Loc. 1: 55 spec. ; Loc. 2: 7 spec. ; Loc. 3: 56 ♁♁ 2 ♀♀ ; Loc. 5: 2 spec. ; Loc. 6: 16 spec. ; Loc. 8: 35 spec. ; Loc. 9: 7 spec. ; Loc. 10: 9 spec. ; Loc. 11: 17 spec. ; Loc. 12: 27 spec. ; Loc. 14: 50 spec.