An Annotated checklist and key to the Turkish Elongated Water Scavenger Beetles (Coleoptera: Hydrochidae)

An annotated checklist of the genera of Hydrochidae known from Turkey is presented, with some materials and selected references. Hydrochus elongatus (SCHALLER), is recorded for the first time to the Turkish fauna; and proposes Hydrochus flavipennis KUSTER as new in West Anatolia. For each taxon, the paper also includes zoogeographical remarks and chorotype information. A key to the species of the genus from Turkey is presented.