True, that's 7. Plus, I remember looking at the card collection on Bakugan.com, and there was one that looked like a mite, but with a skull on it's back. That could be the eighth one.
I checked that out, and that's a Darkus Limulus. The 8th one could be Aquos Wantu, though. If you don't know what Wantu is, you can watch episode 8 of New Vestroia on YouTube.
How is it a Darkus LIMULUS? It has a skull on its back, limulus does not.