Hitchhiker on trochus shell

[liam]

I was cleaning some trochus snails before adding to my system today and came across a good sized lump on ones shell that appeared to be made up of dirty sand.when I busted off the lump I found this worm type critter inside.
It has some good sized pinchers up front and the head looks like a Bobbitt worm up close,the body does not.
Is this a young Bobbitt or something else,any ideas TIA

 

[IKD]

Can’t recall the same, but I do believe they are a pest or predatory. Will reply again if I can find my notes.

 

[Zoa_Fanatic]

I was cleaning some trochus snails before adding to my system today and came across a good sized lump on ones shell that appeared to be made up of dirty sand.when I busted off the lump I found this worm type critter inside.
It has some good sized pinchers up front and the head looks like a Bobbitt worm up close,the body does not.
Is this a young Bobbitt or something else,any ideas TIA

No clue that is but it looks predatory for sure