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New faunistic data are presented for six water beetle families from Mongolia. The family Dryopidae, with the genus Dryops Olivier, 1791, and the genus Platambus Thomson, 1859 of the family Dytiscidae are recorded for the first time from Mongolia. Agabus semipunctatus (Kirby, 1837), previously known only from the Nearctic Region, is reported for the first time from the Palearctic. Eight species of water beetles are recorded for the first time from Mongolia: Dytiscidae (6): Agabus mandsuricus (Guignot, 1956), A. semipunctatus, Platambus maculatus (Linnaeus, 1758), Hydroporus cf. breviusculus Poppius, 1905, H. goldschmidti Gschwendtner, 1923, H. striola (Gyllenhal, 1826); Hydrophilidae (1): Laccobius binotatus Orchymont, 1934; Dryopidae (1): Dryops similaris Bollow, 1936. The presence of Rhantus suturalis (Macleay, 1825) is confirmed for the fauna of Mongolia. First province records are listed for 41 species, and for four species of Hydraenidae, the list of literature-based province records provided by Prokin et al. (2020) is supplemented or respectively corrected. [ABSTRACT FROM AUTHOR]

Twenty-eight species of water beetles and shore beetles are recorded for the first time from Mongolia: Dytiscidae (16): Acilius sulcatus (Linnaeus, 1758), Agabus amoenus (Solsky, 1874), A. blatta Jakowlew, 1897, A. japonicus continentalis Guéorguiev, 1970, A. moestus (Curtis, 1835), A. thomsoni (Sahlberg, 1871), Bidessus nasutus Sharp, 1887, Colymbetes dolabratus (Paykull, 1798), Dytiscus circumcinctus Ahrens, 1811, Hydaticus aruspex Clark, 1864, H. continentalis Balfour-Browne, 1944, Hydroglyphus trassaerti (Feng, 1936), Hygrotus confluens (Fabricius, 1787), Laccornis oblongus (Stephens, 1835), Nebrioporus assimilis (Paykull, 1798), Rhantus rufus Zimmermann, 1922; Helophoridae (3): Helophorus bergrothi Sahlberg, 1880, H. kryzanovskii Angus, 1984, H. timidus Motschulsky, 1860; Hydrophilidae (6): Crenitis apicalis (Reitter, 1896), Enochrus coarctatus (Gredler, 1863), E. melanocephalus (Olivier, 1792), E. testaceus (Fabricius, 1801), Laccobius syriacus Guillebeau, 1896, Paracymus chalceolus Solsky, 1874; Hydraenidae (1): Ochthebius joosti Jäch, 1992; Heteroceridae (2): Augyles obliteratus (Kiesenwetter, 1843), Heterocerus marginatus (Fabricius, 1787). The presence of Haliplus ruficollis (De Geer, 1774) (Haliplidae), Hydroglyphus hamulatus (Gyllenhal, 1813) (Dytiscidae), Cercyon marinus (Thomson, 1853), Hydrophilus dauricus Mannerheim, 1852, Paracymus aeneus (Germar, 1824) (Hydrophilidae), and Ochthebius evanescens Sahlberg, 1875 (Hydraenidae) in Mongolia is confirmed by new findings. For 76 species, new faunistic records are listed. [ABSTRACT FROM AUTHOR]