Family Notonectidae. Elongate water bugs, with two prominent, narrow swimming legs. They swim with a jerky motion. Common insects in wetlands and slow river sections.
Identification guide for larvae: The Waterbug App. This is a very helpful guide for identifying aquatic insects, including backswimmers. The App is free, and available for iOS and Android devices.
Notonectidae (family) is listed in the following regions:
Canberra & Southern Tablelands | South Coast | Hume | Barwon South West
Maps
ANBG Bluetts Block (402, 403, 12, 11) Bruce Ridge to Gossan Hill Callum Brae Dryandra St Woodland Illilanga & Baroona Jerrabomberra Wetlands Jindalee National Park Namadgi National Park Piney Ridge Rugosa Tidbinbilla Nature ReservePlaces
Bruce, ACT Burrinjuck, NSW Chisholm, ACT Kambah, ACT Michelago, NSW