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The   Haliplidae  ,   Gyrinidae   and   Dytiscidae   (  Coleoptera  ) of Prince Edward Island, Canada were surveyed during the years 2004–2005. A total of 2450 individuals from 79 species were collected from 98 different localities, among which 30 species are newly recorded from that region. Among these,    Acilius   sylvanus    Hilsenhoff,    Rhantus   consimilis    Motschulsky and    Neoporus   sulcipennis    (Fall) stand out as representing the easternmost reports of these species in Canada. Once removed,    Gyrinus   aquiris    LeConte (  Gyrinidae  ) is reinstated in the faunal list of Prince Edward Island. According to this study and literature 84 species of   Hydradephaga   are currently known from Prince Edward Island. The Nearctic component of the fauna is made up of 68 species (80.9%) and the Holarctic component of 16 species (19.1%). Most species are characteristic of the Boreal and Atlantic Maritime Ecozones and have a transcontinental distribution. In an examination of the   Hydradephaga   of insular portions of Atlantic Canada, we found that despite significantly different land areas and different distances to the neighbouring continental mainland the island faunas of Prince Edward Island and insular Newfoundland are very similar in the number of species (84 and 94 species respectively) despite differences in composition. With a land area significantly larger than that of Prince Edward Island, however, the fauna of Cape Breton Island was 39% smaller consisting of 53 species. This difference could be due to the comparative lack of collecting efforts on Cape Breton Island.

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Further contributions to the   Hydradephaga   (  Coleoptera  ,   Haliplidae  ,   Gyrinidae   and   Dytiscidae  ) fauna of Prince Edward Island, Canada: new records, distributions and faunal composition