Skeletal remains

I was tidying the wee flower border beside the pond this afternoon when I spied what I thought was a giant insect clinging to a primula leaf. I dashed into the house to get my camera, quite sure that it would have disappeared before I got back. But no, it was still there so, in my excitement, fumbling with the settings, I eventually managed to get focussed and snapped the creature. However, as I zoomed in, I realised that time had already caught up with it and it was just a shell of its former self!
Husband thinks that this had probably been living in our pond as a larva until it was ready to emerge onto land and metamorphose into a beautiful dragonfly, ready to take to the air.
If there are any experts reading this, we would be happy to be corrected and learn more.