2nd Guessing Article

Congratulations to lord alphabet for guessing the first animal (Gigantopithecus)

I am animal.

1. I lived in Australia and Columbia.
2. I was between 9 and 10 metres long.
3. I lived under water
4. I was a marine reptile
5. My teeth exceed 7 cm long and my largest can be up to 30 cm long
6. I lived in the ocean