What is this underneath my mushroom?

[tygger]

Can anyone identify what that thing is underneath the mushroom in the center of the pic?

Thanks!

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[reefnetworth]

looks alot like a Black Turbo snail with purple coralline...

 

[reefnetworth]

oh! are you asking about the white strands? i just noticed, it appears its laying eggs.

 

[tygger]

Sorry... let me describe it better...

The mushroom is attached to a turbo snail shell. I'm trying to figure out what that squiggly thing is directly between the mushroom and shell. I've never really looked underneath a mushroom before, is that just part of it?

 

[DetectiveTofu]

mesenterial filaments