Help me identify this creature

[gfinan]

It's white, came on a Halloween hermit crab shell. Kind of looks like a flatworm but not really. Should I take it out of the tank? The shell is no longer inhabited, so I could easily just throw it away.

 

[Euphylliaphyle]

Looks like a limpet. Do you have SPS corals? Some have a reputation for damaging SPS (I don't know if this is true and can't tell the difference regardless). I think most people happily count them among their CUC, but others remove them.

 

[gfinan]

I do, I have one Pavona coral. I may just get rid of it to be cautious - thanks

 

[Üter]

not positive but in addition to your limpet, you might have a barnacle to the right of it. the blue light its hard to tell.

 

[Euphylliaphyle]

not positive but in addition to your limpet, you might have a barnacle to the right of it. the blue light its hard to tell.

Good catch!

 

[gfinan]

not positive but in addition to your limpet, you might have a barnacle to the right of it. the blue light its hard to tell.

I think its just another one of the same creature, just smaller. The picture isn't very good, sorry

 

[Elisabeth GER]

https://reeflex.net/tiere/3360_Hipponicidae_sp01.htm

 

[ISpeakForTheSeas]

https://reeflex.net/tiere/3360_Hipponicidae_sp01.htm

Yeah, a Hoof Snail (taxonomic family Hipponicidae) would be my first thought with the shape of the shell here.

I need to get around to figuring out a proper way to differentiate these beside their feeding methods, but if it's not a hoof snail, then it may be a Slipper Snail (family Calyptraeidae) or possibly even a Foam/Honeycomb Oyster (family Gryphaeidae) though this one is much less likely - any are harmless:

Yeah, looks like either a Slipper Limpet (genus Crepidula) or a Hoof Snail (taxonomic family Hipponicidae) - both are harmless; slipper snails are filter feeders, and hoof snails feed by extending a long proboscis (think like an elephant's trunk) to eat either their host snail's waste or any food it can reach from its host's back.