Maybe you will be able to get some home and get some breeding sometime .Yes, too bad I did not take any of them. We actually found a few more in the stream! some of them have lighter colourations.
I agree, It's been IDed at Shrimp Now though, can't remember what they IDed it as...I'd say that it's a Macrobrachium species for sure, but can't really say which one. You might find some help from a book about Malaysian shrimp species.