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Thyreophora: Armored Dinosaurs like Ankylosaurus and Stegosaurus. These are what I would consider to be the âmain typesâ of dinosaurs. Technically speaking, each of these families are divided into even smaller sub groups, but this is the basic way Iâve looked at it for most of my life.
The extinct aquatic reptiles, such as the plesiosaurs, and the extinct flying reptiles, such as the pterodactyls, are not classified as dinosaurs, and most evolutionists do not believe that they evolved into birds.he theropod type of dinosaur that is believed to have evolved into flying birds is, to say the least, poorly designed for flight. These dinosaurs have small forelimbs that typically canât even reach their mouths. It is not clear what theropods, such as the well-known T. rex, did with their tiny front limbs.