Here is a video I made of a great silver water beetle larva (Hydrophilus piceus) feeding on a wandering pond snail (Radix labiata). It has an interesting method of feeding where, after grabbing the snail in its unsymmetrical mouthparts, it then curls its body around it to get a better hold as is devours it! I filmed this in the video below
If you listen closely you can hear the mouthparts cracking the shell!