Further contributions to the Hydradephaga (Coleoptera, Haliplidae, Gyrinidae and Dytiscidae) fauna of Prince Edward Island, Canada: new records, distributions and faunal composition Author Alarie, Yves text ZooKeys 2016 600 103 129 http://dx.doi.org/10.3897/zookeys.600.8856 journal article http://dx.doi.org/10.3897/zookeys.600.8856 1313-2970-600-103 97B30DD8F5B34A569C7478C655230D31 97B30DD8F5B34A569C7478C655230D31 Taxon classification Animalia Coleoptera Dytiscidae Ilybius discedens Sharp Note. Although found in relatively low numbers (seven specimens), this species is reported from each of the three Prince Edward Island counties (Table 2). Habitat. Ilybius discedens is one of the most characteristic water beetle species of boreal peatland generally occurring in small, moss-ringed pools, often where the water is cold to the touch ( Larson et al. 2000 ). In Prince Edward Island, the majority of specimens were collected from Sphagnum bogs, although a few specimens were associated with eutrophic lotic habitats (Table 1). Distribution in the Maritime Ecozone. This species is also known from the neighboring Provinces of New Brunswick and Nova Scotia ( Larson et al. 2000 ), and the Magdalen Islands ( Alarie 2009 ).