An annotated checklist of the Hydradephaga of Belgium (Coleoptera Dytiscidae, Gyrinidae, Haliplidae, Hygrobiidae, Noteridae)

An updated checklist of the Belgian Hydradephaga is presented. In total 146 species of Hydradephaga are known from Belgium with certainty. This includes 112 Dytiscidae, 11 Gyrinidae, 20 Haliplidae, one Hygrobiidae and two Noteridae. Graphoderus austriacus (Sturm, 1834) is recorded from Belgium for the first time. New provincial records are given for 15 species. 17 species that were mentioned by early authors are omitted from the Belgian species list. 22 species have only been recorded prior to 2000 and are considered to be extinct in Belgium. All Belgian species are listed and for each species the bibliography and distribution is provided.