Unidentified aquatic insect

Unidentified aquatic insect

Observation - Unidentified aquatic insect. Description: Strange,scorpion-like insect with front legs like scorpion's claws. Is it a nymthal stage of some aquatic beetle or dragon-fly?

Strange,scorpion-like insect with front legs like scorpion's claws. Is it a nymthal stage of some aquatic beetle or dragon-fly?