Nemertea - Alchetron, The Free Social Encyclopedia

"Ribbon worm" These fractal-faced worms belong to the phylum Nemertea, a group of animals that hunt using a tongue-like proboscis like the one you see shooting out above. However, in this case the worm is under an immense amount of stress. The reason for the expelling of the proboscis is that the worm thinks that it is being attacked. It's trying to leave the proboscis behind for the predator so that it can escape – it's trying everything to stay alive. Link to article in the comments. Mysteriol