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 | Barwon South West
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ANBG Block 402 Bruce Ridge to Gossan Hill Callum Brae Dryandra St Woodland Illilanga & Baroona Jerrabomberra Wetlands Jindalee National Park Namadgi National Park Piney Ridge QPRC LGA Rugosa Tidbinbilla Nature ReservePlaces
Acton, ACT Bruce, ACT Cootamundra, NSW Fyshwick, ACT Googong, NSW Greenleigh, NSW Jerrabomberra, NSW Kambah, ACT Michelago, NSW Murrumbateman, NSW O'Connor, ACT Paddys River, ACT Rendezvous Creek, ACT Stromlo, ACT Symonston, ACT Wamboin, NSW Yass River, NSW