
I know these threads have been done in the past, but why not have one more? :P
I'll start off-
Stegosaura- Stegosaurus
Ankylosaurus- Gastonia
Ornithopoda- Parasaurolophus
Ceratopsia- Styracosaurus
Pacycephalosaura- Pachycephalosaurus
Prosauropoda- Plateosaurus
Sauropoda- Amargasaurus
(Note: Theropoda is too vague, so I'll branch them off into smaller groups)
Tyrannosaurs- Yutyrannus
Spinosaurs- Spinosaurus
Dromaeosaurs- Utahraptor
Therizinosaurs- Therizinosaurus
Allosaurs- Allosaurus
Just share your favorite in each group (it doesn't really matter what the groups are called/what's in it). :)
“Banana oil.”- George Takei, Gigantis: The Fire Monster

Stegosaura- Stegosaurus
Ankylosaur- Ankylosaurus
Ornithopoda- Parasaurolophus
Ceratopsia- Triceratops
Pacycephalosaura- Dracorex
Prosauropoda- Plateosaurus
Sauropoda- Brachiosaurus
Tyrannosaurs- Yutyrannus/Tyrannosaurus/Albertosaurus (can't decide)
Spinosaurs- Spinosaurus
Dromaeosaurs- Utahraptor
Therizinosaurs- Therizinosaurus
Allosaurs- Epanterias
When life gives you lemons, don't make lemonade. Tell life I don't want you're damn lemons, and then squeeze them into life's eyes!

Stegosaura-Stegosaurus
Ankylosaura-Ankylosaurus
Ornithopoda-Parasaurolophus or Lambeosaurus
Ceratopsia-Triceratops
Pachycephalosauria-Pachycephalosaurus
Prosauropoda-Massospondylus
Sauropoda-Brachiosaurus
Tyrannosaurid-T.rex
Spinosaurid-Spinosaurus
Dromaeosaurid-Utahraptor
Therizinosaurid-Nothronychus
Allosaurid-Allosaurus
Carcharodontosaurid-Giganotosaurus

Stegosauria- Kentrosaurus
Ankylosaura- Polocanthus
Ornithopoda- Parasaurolophus
Ceratopsia- Triceratops
Pachycephalosauria- Dracorex
Prosauropoda- Plateosaurus
Sauropoda- Argentinosaurus
Tyrannosaurid- Tyrannosaurus rex
Spinosaurid- Spinosaurus
Dromaeosaurid- Utahraptor
Therizinosaurid- Therizinosaurus
Allosaurid- Allosaurus
Carcharodontosaurid- Giganotosaurus
Ornithomimosauria- Deinocheirus

Spinosaurs-Spinosaurus
Carcharodontosaurid-Giganotosaurus
Dromaeosaurid-Utahraptor
Tyrannosaurid-Tyrannosaurus rex/Albertosaurus
Allosaurid-Allosaurus

Stegosaurus.
Ankylosaurus.
Magnipulia.
Eotriceratops.
Plateosaurus.
Amphiceolias.
Tyrrannosaurus.
Utahraptor.
Spinosaurus.
Therizenosaurus.
Saurophaganax.
Monolophosaurus.
Torvosaurus.
Ekrixinatosaurus.

Stegosaura- Stegosaurus
Ankylosaurus- Ankylosaurus
Ornithopoda- Parasaurolophus
Ceratopsia- Triceratops
Pacycephalosaura- Pachycephalosaurus
Prosauropoda- Plateosaurus
Sauropoda- Argentinosaurus
Tyrannosaurs- Tyrannosaurus rex
Spinosaurs- Spinosaurus
Dromaeosaurs- Dakotaraptor
Therizinosaurs- Therizinosaurus
Allosaurs- Tyrannotitan
"Part of the journey is the end..."

Stegosaura- Stegosaurus
Ankylosaurus- Ankylosaurus
Ornithopoda- Parasaurolophus
Ceratopsia- Eotriceratops
Pacycephalosaura- Pachycephalosaurus
Prosauropoda- Plateosaurus
Sauropoda- Amargasaurus
Tyrannosaurs- Tyrannosaurus rex
Spinosaurs- Spinosaurus
Dromaeosaurs- Dakotaraptor
Therizinosaurs- Therizinosaurus
Allosaurs- Saurophaganax
"Part of the journey is the end..."

Stegosauria - Dacentrurus
Ankylosauria - Ankylosaurus
Hadrosauridae - Edmontosaurus
Ornithopoda - Iguanodon
Ceratopsia - Styracosaurus
Pachycephalosaura - Stygimoloch
Prosauropoda - Plateosaurus
Sauropoda - Argentinosaurus
Tyrannosauridae - Tyrannosaurus Rex
Spinosauridae - Suchomimus
Dromaeosauridae - Utahraptor
Therizinosauridae - Notronychus
Allosauridae - Allosaurus
Carcharodontosaurid - Giganotosaurus