ID Help - Sea Spider?

[Jxw6963]

Found this on a zoa frag plug, couple weeks after first dipped and put in the tank. It seems to already have died though, didn't move after I removed it

Any idea what it is, sea spider?

 

[ndrwater]

Looks more like a crab to me....

 

[Tahoe61]

Yup. Sea Spider.

 

[Jxw6963]

Ok, thanks. Hopefully this died in the dip and I just didnt get it off. And hopefully no others

 

[Tahoe61]

Cool creatures, nightmare for Zoanthid.

 

[Jxw6963]

Looks more like a crab to me....

Was wondering that at first but crabs normally have 8 legs plus 2 claws, this looks like it has 7 legs with one missing