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Prehistoric animals (Dinosaurs (Ornitschia (Early ornitschians and…

- - - - Pisanosaurus
      - Chilesaurus
      - Eocursor
      - Lesothosaurus
      - Fabrosaurids
        
        Agilisaurus
        
        Gongbusaurus
        
        Fabrosaurus
    - - Neornitschia
        
        Hexinluosaurus
        
        Isaberrysaura
        
        Kullindadromeus
        
        Phylldon
        
        Sanxisaurus
        
        Xiaosaurus
        
        Jeholosaurids
        
        Yueosaurus
        
        Jeholosaurus
        
        Nanosaurids
        
        Nanosaurus
        
        Parksosaurids
        
        Orodrominae
        
        Albertadromeus
        
        Changchunsaurus
        
        Haya
        
        Koreanosaurus
        
        Orodromeus
        
        Oryctodromeus
        
        Zephyrosaurus
        
        Thescelosaurinae
        
        Thescelosaurus
        
        Parksosaruus
        
        Notohypsliophodon
        
        Elasmaria
        
        Clypeodonta
        
        Hypsilophodon
        
        Cerapoda
        
        Marginocephalia
        
        Pachycephalosauria
        
        Wannanosaurus
        
        Pachycephalosaurids
        
        14 more items...
        
        Ceratopsia
        
        Stenopelix
        
        Micropachycephalosaurus
        
        Albalophosaurus
        
        Chaoyangasurids
        
        4 more items...
        
        Psittacosaurids
        
        1 more item...
        
        Neoceratopsia
        
        12 more items...
        
        Ornithopoda
        
        Burianosaurus
        
        Convolosaurus
        
        Gideonamantellia
        
        Weewarrasaurus
      - Serendipaceratops
      - Tyrephora
    - - Enchinodon
      - Fruitadens
      - Tianyulong
      - Heterodontosaurinae
        
        Abrictosaurus
        
        Manidens
        
        Pegomastax
        
        Lycorhinus
        
        Heterodontosaurus