Please ID my prawn

[spongebob281]

I picked up a 3 inches prawn at the LFS for $15 but I need someone to ID it for me. I know the pics is not all that great but he was in a corner so i couldnt get a better angle

Heres the link
http://i384.photobucket.com/albums/oo28 ... G_4078.jpg

[Veneer]

Definitely a Macrobrachium, but the image isn't good enough for me to hazard a guess at what species (and there are around 250...). Cheliped shape and the green stripe around the rostrum (if that's not just a photographic artifact) suggest that it's not M. rosenbergii (one of the species commonly available at that size and price range) but I'd need better shot to say anything for sure.