Ha! I knew you were all going to make ME go research by coming up with tons more than I had ever heard of. 8)
terebellid worm-Neoamphitrite robusta
d9hp - I'm going to pass the torch on to you. I'm not certain that the Lugworm is truly sedentary, but since it's a burrowing worm, it's sedentary enough for me.
I was looking for:
Sabellid worms (Feather Dusters)
Serpulid worms (straight/hard tube dusters & fan worms)
Spirorbid worms (small spiral white tube worms)
Spionid worms (2-tentacle worms which live out of a silt/sand tube)
Terbellid worms (Spaghetti, Medusa, etc.).
Nice work ~ both d9hp & RR!!