Is this a tunicate?

[jkhalliday76]

I have two of these in my tank. They will retract if I tap on the glass. Any ideas??

 

[Woodstock]

It looks like a tunicate to me.

What is a tunicate?

Tunicate Images

 

[jkhalliday76]

Thanks Woodstock. It does look like those tunicate pictures, but the link about what a tunicate is did not work. Can anyone tell me what they are??

 

[Boomer]

I do not think so. Those smaller things just off to the right and below this "thing" are scypha sponges. I assume this is the same, although it is a poor imnage, just a large one. Touch it with a stick, if it moves, flinches it is a tunicate.


Scypha sponges
http://www.habitas.org.uk/marinelife/species.asp?item=C350

http://images.google.com/images?hl=en&q=Scypha&btnG=Google+Search&sa=N&tab=wi

Here is the link Woody was trying to post

http://depts.washington.edu/fhlk12/StudentProjects/Tun.biology.html