ID if you can

No Idea what it is but there was another post from a friend of mine who found one of these a few weeks ago, this was his post:

http://wetpixel.com/forums/index.php?showtopic=14269

However I don't think it is an Isopod and have another image that might help:

Any ideas what it is? to help here are a few details:

It's about 5MM in size, was walking quite fast on a purple sea fan, North Wall Grand Cayman one week ago. When I say walking quite fast about 2MM per second.

Why don't you think it's an isopod? Seems like a perfectly good sphaeromatid isopod to me. I know this is a lab shot & therefore unworthy of WP but it does show what a sphaeromatid looks like.

Should have known to listen to you Leslie, I now agree. Thanks!

And thanks for posting such a cute little guy! I'm going to send it to my friend Regina, the sphaeromatid queen, who will probably squeal with delight (imagine, preferring pods to worms..... )

Things like that are exactly why I don't go skinny dipping in the ocean.