I see some long, weird translucent tentacles coming out of my live rock! What is it?
These are most likely the tentacles of a Terebellid polychaete (better known as Spaghetti, Medusa or Mason worms), although a recent thread that started like this turned out to be a sipunculid (see Section 4, #4 above). Some of these animals can get quite large (some species have tentacles over 3 feet long!). I discuss these worms in more detail in http://www.aquarium.net/1197/1197_1.
These are most likely the tentacles of a Terebellid polychaete (better known as Spaghetti, Medusa or Mason worms), although a recent thread that started like this turned out to be a sipunculid (see Section 4, #4 above). Some of these animals can get quite large (some species have tentacles over 3 feet long!).
