2 hitchhikers on Trocus?

[jgoldhammer]

I got a Trocus snail with 1 or 2 extra critters. There is live barnacle for sure but need help identifying the flat thing next to it. Looks alive to me but not moving and no clear head. Please help if you can

 

[TX_REEF]

@ISpeakForTheSeas

 

[BristleWormHater]

Looks like a buildup of coralline algae

 

[jgoldhammer]

Crossed my mind too - thanks'l!

 

[ISpeakForTheSeas]

I got a Trocus snail with 1 or 2 extra critters. There is live barnacle for sure but need help identifying the flat thing next to it. Looks alive to me but not moving and no clear head. Please help if you can

If it's not just coralline, it could be a Hoof Snail (unlikely, as you'd see it poking it's long proboscis out to feed sometimes), a Slipper Limpet (which filter-feeds, so you wouldn't see it other than the shell), or a Foam/Honeycomb Oyster (also filter-feeds).

None would be harmful, so it's nothing to worry about either way.

@ISpeakForTheSeas