All the families were herbivorous.
Group
- Family
- Genus
- Time period; Length from nose to tip of tail
Ankylosauria
- Ankylosauridae
- Ankylosaurus
- Cretaceous; 10 m / 33 ft
- Euoplocephalus
- Cretaceous; 6 m / 20 ft
- Pinacosaurus
- Cretaceous; 5 m / 16 ft
- Saichania
- Cretaceous
- Sauroplites
- Cretaceous
- Shamosaurus
- Cretaceous
- Talarurius
- Cretaceous
- Tarchia
- ??
- Nodosauridae
- Dracopelta
- ??
- Hylaeosaurus
- Cretaceous; 4 m / 13 ft
- Minmi
- ??; 2.5 m / 8 ft
- Nodosaurus
- Cretaceous; 5.5 m / 18 ft
- Panoplosaurus
- Cretaceous
- Polacanthus
- Cretaceous; 4 m / 13 ft
- Sarcolestes
- Jurassic
- Sauropeita
- Cretaceous
- Silvisaurus
- Cretaceous; 4 m / 13 ft
- Struthiosaurus
- ??
Ceratopsia
- Ceratopsidae
- Agathaumas
- ??
- Anchiceratops
- Cretaceous; 6 m / 20 ft
- Arrhinoceratops
- Cretaceous
- Brachyceratops
- Cretaceous
- Centrosaurus
- Cretaceous; 6 m / 20 ft
- Chasmosaurus
- Cretaceous; 5.2 m / 17 ft
- Diceratops
- ??
- Eoceratops
- ??
- Eucentrosaurus
- ??; 6 m / 20 ft
- Monoclonius
- ??
- Pachyrhinosaurus
- Cretaceous; 5.5 m / 18 ft
- Pentaceratops
- Cretaceous; 7 m / 23 ft
- Styracosaurus
- Cretaceous; 5.5 m / 18 ft
- Torosaurus
- Cretaceous; 7.5 m / 25 ft
- Triceratops
- Cretaceous; 9 m / 30 ft
- Protoceratopidae
- Bagaceratops
- Cretaceous; 1 m / 3.3 ft
- Leptocerastops
- Cretaceous; 2.1 m / 7 ft
- Microceratops
- ??; .75 m / 2.5 ft
- Montanoceratops
- Cretaceous
- Protoceratops
- Cretaceous; 1.8 m / 6 ft
- Psittacosauridae
- Psittacosaurus
- Cretaceous; 2 m / 6.5 ft
Ornithopoda
- Fabrosauridae
- Alcodon
- Jurassic
- Echinodon
- Jurassic, Cretaceous
- Fabrosaurus
- Jurassic
- Gongbusarus
- ??
- Lesothosaurus
- Jurassic; 0.9 m / 3 ft
- Nanosaurus
- ??
- Scutellosaurus
- Jurassic; 1.3 m / 4.4 ft
- Trimucrodon
- ??
- Hadrosauridae
- Anatosaurus
- Cretaceous; 10-13 m / 33-42 ft
- Bactrosaurus
- Cretaceous; 4-6 m / 13-20 ft
- Brachylophosaurus
- ??
- Corythosaurus
- Cretaceous; 10 m / 33 ft
- Edmontosaurus
- Cretaceous; 10-13 m / 33-42 ft
- Gryposaurus
- ??; 8-10 m / 26-33 ft
- Hadrosaurus
- Cretaceous; 8-10 m / 26-33 ft
- Hypacrosaurus
- ??; 9 m / 30 ft
- Kritosaurus
- Cretaceous; 9 m / 30 ft
- Lambeosaurus
- Cretaceous; 15 m / 49 ft
- Maiasaurus
- ??; 9 m / 30 ft
- Parasaurolophus
- Cretaceous; 10 m / 33 ft
- Procheneosaurus
- ??
- Prosaurolophus
- ??
- Saurolophus
- Cretaceous; 9-12 m / 30-40 ft
- Secernosaurus
- ??
- Shantungosaurus
- ??; 15 m / 49 ft
- Tsintaosaurus
- Cretaceous; 7 m / 23 ft
- Heterodontosauridae
- Abrictosaurus
- ??
- Geranosaurus
- ??
- Heterodontosaurus
- Jurassic; 1.2 cm / 4 ft
- Loncosaurus
- ??
- Orodromeus
- ??; 2.5 m / 8 ft
- Yandosaurus
- ??; 1.5 m / 5 ft
- Hypsilophodontidae
- Dryosaurus
- Jurassic; 3-4 m / 10-13 ft
- Dysalotosaurus
- Jurassic
- Fulgurotherium
- Cretaceous
- Hypsilophodon
- Cretaceous; 2 m / 6.5 ft
- Lanasaurus
- ??
- Othnelia
- Jurassic
- Parksosaurus
- Cretaceous
- Thescelosaurus
- Cretaceous; 3.3 m / 11 ft
- Valdosaurus
- Cretaceous
- Zephyrosaurus
- Cretaceous
- Iguanodontidae
- Callovosaurus
- ??
- Camptosaurus
- Jurassic; 5-7 m / 16-23 ft
- Craspedodon
- ??
- Cumnoria
- ??
- Iguanadon
- Cretaceous; 10 m / 33 ft
- Kangnasaurus
- Cretaceous
- Mochlodon
- Cretaceous
- Muttaburrasaurus
- Cretaceous; 7 m / 23 ft
- Ouranosaurus
- Cretaceous; 7 m / 23 ft
- Probactrosaurus
- Cretaceous; 6 m / 20 ft
- Vectisaurus
- ??
- (Miscellaneous)
- Lusitanosaurus
- Jurassic
- Scelidosaurus
- Jurassic; 4 m / 13 ft
Pachycephalosaurs
- Pachycephalosauridae
- Goyocephale
- ??
- Gravitholus
- ??
- Homalocephale
- Cretaceous; 3.3 m / 10 ft
- Majungatholus
- Cretaceous
- Micropachycephalosaurus
- ??
- Ornatotholus
- ??
- Pachycephalosaurus
- Cretaceous; 8 m / 26 ft
- Prenocephale
- Cretaceous; 2.5 m / 8 ft
- Stegoceras
- Cretaceous; 2 m / 6.5 ft
- Stygimoloch
- ??
- Troödon
- ??
- Tylocephale
- ??
- Wannanosaurus
- ??; 0.6 m / 2 ft
- Yaverlandia
- Cretaceous
Stegosauria
- Stegosauridae
- Chialingosaurus
- ??
- Craterosaurus
- Cretaceous
- Dacentrurus
- 15 ft / 4.5 m
- Dravidosaurus
- Cretaceous
- Huayangosaurus
- Jurassic; 4 m / 13 ft
- Kentrosaurus
- Jurassic; 8 ft / 2.5 m
- Lexovisaurus
- Jurassic
- Paranthodon
- ??
- Stegosaurus
- Jurassic; 20-25 ft / 6-7.5 m
- Tuojiangosaurus
- Jurassic; 6 m / 20 ft
- Wuerhosaurus
- Cretaceous; 6 m / 20 ft
