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 Enochrus ( Lumetus ) cf. quadrinotatus (Guillebeau, 1896) Material examined. Oman , Wadi Muqshin, 19°35′07″N 54°53′03″E , 108 m , iv.2011 , S. Carranza leg.: 1 ♁ 1 ♀ (♁ used for DNA extraction, voucher No. IBE-RA490/IBE-RA553, sequences published in ARRIBAS et al. 2014 ; PALLARÉS et al. 2017 ). Notes. Species new for the Arabian Peninsula. The studied specimens were tentatively identified as E. quadrinotatus in ARRIBAS et al. (2014) and PALLARÉS et al. (2017) , described from Syria , although it would be necessary to study the type material of this species to confirm the identification.According to the molecular data the species belongs to the E. bicolor complex, being sister to a clade including E. falcarius Hebauer, 1991 , E. segmentinotatus (Kuwert, 1888) , E. risii Arribas & Millán, 2013 and E. cf. turanicus Schödl, 1998 ( PALLARÉS et al. 2017 ). The male genitalia and external morphology are clearly different from E. sinuatus d’Orchymont, 1937 (see SCHÖDL 1998 ) which was recorded from the UAE by FIKÁČEK et al. (2010) .