Thanks for the link!
I found 2 of these things about a year and a half ago...
Scariest bug I've ever seen in person, I'm sort of a little girl when it comes to creepy crawlers though. Anyway, we put one of these guys in an ice cream pale with a bunch of small water beetles, and he turned out to be quite a fighter. He did not like those water beetles.
Both of the ones I found were a bit bigger than the one in the picture though, I'd say 3 inches.