Dinosaurs are a diverse group of animals of the clade Dinosauria. How many types of dinosaur were there? At present over 700 different species of dinosaurs have been identified and named. However palaeontologists believe that there are many more new and different dinosaur species still to be discovered. There drawing tutorials will guide you to draw some of these awesome prehistoric creatures including T-Rex, Velociraptor, Triceratops, Ankylosaurus, etc.