Quote Originally Posted by Yukimura
Aren't there 9 tailed beasts, I know there are nine akatsuki.
Well, I'd say there's about a 90% chance that there are 9 tailed beasts. But it's not been specifically stated.

Maybe there isn't a beast with each tail number, or maybe they don't stop at 9. Who can say at this point.

But yeah, I'd definatly guess that there's 9 beasts with tails going from 1-9.