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The species list of Dytiscidae of Iran has been composed using recently studied material and all literature data known to us. We report 139 species of Iranian diving beetles including one Dytiscus species of uncertain taxonomic position. Two species, Agabus amoenus Solsky, 1874 and Copelatus pulchellus (Klug, 1834) are recorded for the first time from Iran. For 57 species, new provincial records are provided. Twenty-two species and one genus have been excluded from the Iranian diving beetle fauna as based on misidentifications. The distributional pattern in Iran and preferred habitat (if available) are summarised for each species and discussed in general. [ABSTRACT FROM AUTHOR]

Hydroglyphus sinuspersicus sp. nov. is described from the United Arab Emirates, Oman and Iran. It is very similar to H. major (Sharp, 1882). Hydroglyphus gujaratensis (Vazirani, 1973) known previously only from Gujarat (India) is redescribed, based on recently collected material from Rajasthan (India), Iran and Oman. The first national records are given for Hydroglyphus major from Libya and for H. infirmus (Boheman, 1848) from Oman and Yemen. [ABSTRACT FROM AUTHOR]