Well, I'm stumped.
And so is everyone else I guess. I've seen some species that look kind of like you're describing but I can't think of any names offhand.
A couple guesses from doing random google searches
http://en.wikipedia.org/wiki/Squat_lobster
This one is called Lambrus angulifrons from what I can gather
http://www.aquaworld-crete.com/images/longarmed-crab.jpg
Doubt they're what you're looking for, but I tried, lol.
And so is everyone else I guess. I've seen some species that look kind of like you're describing but I can't think of any names offhand.
A couple guesses from doing random google searches
http://en.wikipedia.org/wiki/Squat_lobster
This one is called Lambrus angulifrons from what I can gather
http://www.aquaworld-crete.com/images/longarmed-crab.jpg
Doubt they're what you're looking for, but I tried, lol.