Conclusions

Theropods seem to be more diverse than either sauropodomorphs or ornithischians.
Dinosaur diversity was high in the Carnian, and highest in the Kimmeridgian and late Cretaceous.
The USA, China and Mongolia account for more than half of dinosaur genera between them.
The rate of naming new dinosaur genera is increasing exponentially.
Diversity figures can't be taken at face value because so many biases affect the apparent diversity.

Theropods seem to be more diverse than either sauropodomorphs or ornithischians.