Anyone have any clue on this hitchhiker. he's been in my tanks for as long as I've had the live rock he' attached to. Hasn't bothered anything and has been about that size for at least five years.
If you would like to read more, google: ISOPHELLIIDAE - Telmatactis cricoides
For ID, note that the Telmatactis spp. tentacles have blunt, club-like tips. The innermost ring (nearest the mouth) is comprised of six rather stout tentacles.
