Hi @JimL , this sighting and your other recent one (Gerridae (family) (Water strider)) appear to be water striders! They are water bugs — a type of insect, rather than a species of spider — so I am putting the Gerridae (family) suggestion forward for the insect moderator team to identify further :). Many water spiders are much larger than these guys, as well as having 8 legs!! The Canberra and Southern Tableland regions have many reference records you could look through if you're interested: Pisauridae sp. (family)
This is a waterbug order Hemiptera. If this is an image of it swimming on its back then it is a backswimmer (family Notonectidae) otherwise if it normally swims back up with legs underneath then it is one of the waterboatmen (family Corixidae). Keys to species can be found in the book Australian Water Bugs by Nils M Andersen & Tom A Weir 2004
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