is this a mantis dr. roy

Not Dr. Roy, but looks like a pistol shrimp to me. The kind that goes with a goby.

Either way, cool little video.
 
It looks like a ghost shrimp - family Callianassidae. They are not closely related to stomatopods. In some places they are called Yabbies. They are digging specialists.

Roy
 
thanks guys. where it came from? irealy dont know. i had these rocks for almost 4 years, the 180 i set up a year. i have never seen this guy.
 
i was about to say Callianassia ghost shrimp as well, but then saw the doc beat me to it :(

i have one in my tank... i only see the molts he leaves behind. They are very common, and used as bait by many fishermen. Dig burrows several feet long.. generally peacefull.
 
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