how many types of dinosaurs were there in all the three peroids?

The "age of dinosaurs" (the Mesozoic Era) included three time periods (the Triassic, Jurassic, and Cretaceous Periods). There is no exact data available on the types of the dinosaurs as scientists believe there are many fossils of dinosaurs still to be discovered. Till now more than 700 species/ types of dinosaurs have been discovered.