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 Cybister ( Cybister ) tripunctatus lateralis (Fabricius, 1798) Material examined. Oman , Al Hadd, 22°26′03″N 59°38′49″E , 20.xi.2016 , S. Carranza, M. Simó & D. Fernández leg.: 1 ♁. Notes. New record for Oman . The last edition of the World catalogue of Dytiscidae ( NILSSON & HÁJEK 2018a ) recognises three subspecies of C. tripunctatus in addition to the nominal form, two of them present in the Arabian Peninsula ( C. t. africanus and C. t. lateralis ). HÁJEK & BRANCUCCI (2011) recorded the subspecies C. t. lateralis from the UAE based on specimens with a brown venter, in contrast to C. t. africanus , which has a black venter. However, GUIGNOT (1961) only recognised the nominal form, with brown venter and a wider posterior part of the elytra, and C. t. africanus , with a black venter and narrower elytra. We follow HÁJEK & BRANCUCCI (2011) in considering this specimen, which has a brown venter, as C. t. lateralis , although the taxonomic status of the subspecies of C. tripunctatus may need to be revised.