direct quote from a related video to yours, located here: http://www.youtube.com/watch?v=ewceyagu07e "the brown nemertean worm is paranemertes peregrina and the polychaete is nereis virens. The namertean likes to prey on polychaetes by shooting out its long proboscis and temporarily paralyzing the polychaete." i'd guess your worm was nereis virens
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