Well, it looked like a beetle.
I was emptying out a 500 litre waterbutt today and in the bottom of it (in about 30cm water) was what looked like a huge beetle (4cm across, 2cm wide .. ish) ... I thought it was dead, but it was clinging to the interior of the tap and it swims... it had two little fins/paddles/flippers (type things!) .. it scuttled around the bottom of the butt, feeding presumably.
I could take a picture but I don't think it'd turn out too well.
Any ideas what it is?
At that sort of size it should be one of the following.
Dytiscus latissimus.
Cybister lateralimarginalis.
Hydrophilus piceus.
Chris
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