What Is this a starfish arm or something else?

[divingdon]

Ok guys found this on the back of my chalice thought it was a sponge but then it walk away.

Anyone know what it is and is it reef safe?

 

[Deanos]

Looks like a Linckia multifora starfish.

http://www.wetwebmedia.com/linckiastars.htm

What you have there is called a comet....

 

[michael Jack]

looks like a starfish arm but could be some kind of slug

 

[guarda]

Very cool, google "My Linkia Starfish Babies!!! Check this out!" and check out that thread. An arm just like yours with 4 tiny arms. Freakshowish.

 

[richardhmc]

haha thats awesome. wonder how it came off