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[SkyShark]

Anyone know what this is? I'm thinking it's a type of tunicate. It came on a frag disk with a ricordia. It didn't do anything for a couple months and then recently it moved about an inch away onto the rock. Main reason I think it's a type of tunicate is because I see two small openings that could be a siphon.
View attachment 17281
View attachment 17282

 

[SynDen]

Looks like a sponge. I have quite a few of those on my live rock

 

[FinsUp]

That was my thought. Looks like a sponge. Good filter feeders.

 

[fishguy69]

+1 on >>>>>Sponge.....

 

[SkyShark]

Looks like a sponge. I have quite a few of those on my live rock

I was thinking that at first, but I wasn't aware of sponges getting up and walking someplace new. This guy definitely moved on its own.

 

[fishguy69]

Really? Unless it's growing that quick. Maybe not a sponge. Can you get a better pic?

V

 

[SkyShark]

Really? Unless it's growing that quick. Maybe not a sponge. Can you get a better pic?

V

yeah, definitely moved, doesn't seem to have grown much. At first i thought it was a baby ricordia that was going to open up, but that never happened. I will try to get a better shot, but it is pretty tucked away.

 

[SkyShark]

Not sure if they are much better, but here are some more pics. I am really interested to find out what this is. Again, it definitely moved on its own about an inch (from the frag disk up a little onto the rock), so i think that rules out sponge.
Front view:
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Side view:
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[Off The Deep End]

Sure looks like a sponge to me...

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[MartinsReef]

When you say it moves; how much does it move?

 

[SkyShark]

When you say it moves; how much does it move?

It only moved once that I can tell. It moved about 1/2 an inch across the frag disk and about 1/2 inch up the rock. It used to be next to the base of the ricordia in that picture. It sure does look like a sponge, but I can't explain how it got up on the rock.

 

[fonduecat]

Could it be a snail that ditched it's shell? I've had a few, they always freak me out.

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[Jeremiah]

Look up stomatella snail.

edit: ignore me - i was responding to post above didn't even notice yours...have no clue what that is

 

[Matt_Arian]

This might sound slightly stupid, but if I recall correctly, didn't Splangler from Ghost Busters say that he witnessed a massive sponge migration? I know it's a movie and that sponges are sessile (for the most part), but I could have sworn that I read somewhere that smaller sponges can move, even though it's a tiny amount per day.

 

[Matt_Arian]

Nevermind, it was Ray who said it. And it was a foot and a half.

[video=youtube_share;KryNGmx56ao]http://youtu.be/KryNGmx56ao[/video]

 

[SkyShark]

Nevermind, it was Ray who said it. And it was a foot and a half.

[video=youtube_share;KryNGmx56ao]http://youtu.be/KryNGmx56ao[/video]

haha. Awesome. Totally explains it and now I want to watch that movie! But really, i am leaning towards it being a sponge.