What in the world is this Worm?!

[plancton]

I captured and kill this huge worm like creature

It was about 6" long and it was fat.

I was trying to capture a mantis, pulled the rock out, it was a huge rock and I went crazy and smashed it with a hammer and this thing was inside.

At the begining I thought it was one of my 3 sea hares, it had the same color and texture that´s why I confused it for one, then saw it carefully and had no eyes and was pretty much like a worm.

What is it?, what does it eat?, is it a bad worm?.

Oh somebody mentioned it might be a cucumber, it does look like one too, but huge, so it might have been beneficial and I killed it, well seriously it was nasty looking.

 

[Premiumaq]

Looks for all the world from that photo to be a sand-sifting cuke... had it created a burrow into the rock, or was it merely huddled inside? Any visible feeding apparatus?

 

[plancton]

it was hidding inside, if it was a sand sifting I would have seen it before.

 

[Premiumaq]

could be a gigantic peanut worm of some sort... but it's just conjecture.

 

[Lmecher]

Definately not a peanut worm, peanut worms look just like a peanut light brown/tan and smoothe textured. It's a cucumber and they are beneficial, really sad that you killed it. Next time inquire before you execute something, somebody would have taken it off your hands.

http://calphotos.berkeley.edu/cgi/i...el-namesoup=matchphrase&title_tag=Peanut+Worm

 

[Airwolf75]

You killed a sea cucumber. I can see tube feet on the bottom