I think you guys are right. macrobrachium ohione to be more exact, if my research isnt mistaken! I never looked up the species now. Lol. Well just to give some info on it, I have had it for about 6 months now and it is a very interesting shrimp to look at when it is out and about. It eats small pellets i feed my fish and well from my observation it only acts aggressive to new additions to the tank. I wouldn't put any small fish in my tank due to my semi-aggressive set up, but in sure it could snatch and hold guppy size fish!