Abstract
The Amphizoidae, Dytiscidae, Gyrinidae and Haliplidae (Coleoptera: Adephaga of Alaska (USA) and the Yukon Territory (Canada) were surveyed during the years 1994, 2016, 2017 and 2019. By adding specimens collected through the Arctic Shorebird Demographic Network survey and those from the collection of the University of Alaska, Fairbanks, a total of 5305 individuals are newly reported, which substantially expand our distributional knowledge of these families from the Alaska-Yukon region. Seventeen species are newly reported from Alaska; three from the Yukon Territory. Following this study 160 species are now recorded for the Alaska-Yukon region (136 in Alaska and 138 in Yukon territory). The Nearctic component of the fauna is made up of 103 species (64.4%), the Holarctic component of 57 species (35.6%). Most species (103, 64.4%) have a transcontinental distribution and are characteristic of the boreal and/or arctic ecozones whilst 57 species (35.6%), are recognised as species with western affinities. Eleven species are considered Beringian.
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