Hystrix Question

[pmac523]

Hey Guys,
I was at Shark Aquarium the other day and i noticed they had Hystrix rays. I know that these rays are very rare due to the export ban and what not so i was wondering how i can tell? Ive tried lookin at pictures online but i cant find many from a reliable source.

Any advice is appreciated on how to differentiate.

 

[Big Daves Rays]

It would look like this.....

 

[Nic]

i doubt george has true hystrix and he might be going senile.....but he does get some odd stuff in