There are hundreds of known dinosaur genera and even more individual species. However, here are the names of a few of the major groups, and an example of each:
Saurischia
Theropoda (bipedal carnivores; T-rex)
Sauropodamorpha (long necked, generally large, plant eating dinosaurs; Apatosaurus)
Ornithischia
Neornithischia
Ornithopoda (small, bipedal plant eaters, and also large, common plant eaters without armor or horns; Edmontosaurus)
Ceratopsia (horned herbivores [ceratopsians]; Triceratops)
Pachycephalosauria (armored-headed bipeds [pachycephalosaurs]; Pachycephalosaurus)
Thyreophora
Ankylosauria (armor covered herbivores; Ankylosaurus)
Stegosauria (herbivores with bony plates sticking vertically upward from thei backs; Stegosaurus)
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