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Pachycephalosaurus This plant-eater gave new meaning to the word "blockhead."
Pachyrhinosaurus This "thick-nosed lizard" roamed the North American forests.
Paralititan This huge sauropod was discovered recently in Egypt.
Parasaurolophus Probably the loudest dinosaur ever to roam the earth.
Pentaceratops This "five-horned" herbivore really had only three.
Placerias Not a dinosaur, but a mammal-like reptile of the late Triassic.
Placodus This blunt-headed reptile sucked shellfish off the ocean floor.
Plateosaurus This herd dinosaur blackened the plains of the late Triassic.
Platnitzkysaurus Its teeth were as sharp as its name is funny.
Platypterygius One of the rare ichthyosaurs to survive into the Cretaceous period.
Plesiosaurus This long-necked swimmer set the standard for aquatic reptiles.
Pliosaurus A complete skeleton if this giant swimmer was recently found in Norway.
Plotosaurus This fast, sleek reptile was the pinnacle of mosasaur evolution.
Polacanthus An extremely spiky ankylosaur of the middle Cretaceous.
Prenocephale This "bonehead" had a round, thick skull.
Prosaurolophus The likely ancestor of both Saurolophus and Parasaurolophus.
Protoceratops A famous dinosaur with a very funky frill.
Protosuchus This land crocodile competed for prey with early dinosaurs.
Psephoderma If a turtle mated with a horseshoe crab...
Psittacosaurus This dinosaur's noggin wouldn't have looked out of place on a parrot.
Pteranodon What folks usually are referring to when the say "pterodactyl."
Pterodactylus The first pterosaur ever to be discovered--and still the most famous.
Pterodaustro A weirdly beaked cousin of Pterodactylus.
Pyroraptor This "fire thief" prowled the plains of prehistoric France.
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Quaesitosaurus This titanosaur may have had unusually sharp hearing.
Quetzalcoatlus One of the largest creatures ever to take to the skies.
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Rahonavis Was it a raptor-like bird, or a bird-like raptor?
Rapetosaurus The only sauropod ever to be discovered on modern-day Madagascar.
Rhamphorhynchus This pterosaur's remains are unusually well preserved.
Rhomaleosaurus One of the most fearsome predators of the Jurassic seas.
Rutiodon This crocodilian's nostrils were located on top of its head.
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Saichania This ankylosaur's name is Chinese for "beautiful."
Saltasaurus The first armored sauropod ever to be discovered.
Sarcolestes The most likely ancestor of the ankylosaurs.
Sarcosuchus A Cretaceous "SuperCroc" that put modern crocodiles to shame.
Saurolophus One of the few hadrosaurs known to have lived on two continents.
Sauropelta This ankylosaur's armor helped keep raptors at bay.
Sauroposeidon One of the tallest dinosaurs ever to walk the earth.
Saurornitholestes A close cousin of Velociraptor.
Scelidosaurus Among the earliest of all the armored dinosaurs.
Scipionyx One of the most perfectly preserved dinosaur fossils ever found.
Scutellosaurus Probably the smallest of all the armored dinosaurs.
Scutosaurus This large, armored reptile lived long before the dinosaurs.
Segnosaurus One of the most unusual (and poorly understood) Cretaceous dinosaurs.
Seismosaurus It was huge, to be sure--but might it have been a species of Diplodocus?
Sellosaurus Another early prosauropod of the Triassic period.
Shantungosaurus The biggest of all the duck-billed dinosaurs.
Shonisaurus The largest ichthyosaur yet to be discovered.
Shunosaurus Anatomically speaking, probably the best known of all the sauropods.
Shuvuuia Scientists can't decide if it was a dinosaur or a bird.
Simosuchus This ancient crocodile had an unusually short skull.
Sinokannemeyeria This primitive reptile was as clumsy as its name.
Sordes A pigeon-sized pterosaur of the late Jurassic.
Sphaerotholus Yet another dome-headed dino from North America.
Spinosaurus This dino was distinguished by the sail-like structure on its back.
Stagonolepis This crocodile-like archosaur was actually a vegetarian.
Staurikosaurus Another primitive theropod of the Triassic era.
Stegoceras This small herbivore was built for high-speed head-butting.
Stegosaurus The small-brained, spike-tailed plant eater.
Stenopterygius A close relative of Ichthyosaurus.
Stomatosuchus This giant crocodile fed on tiny plankton, like a sperm whale.
Struthiomimus This "ostrich mimic" roamed the plains of North America.
Stygimoloch Its name means "demon from the river of death." Got your attention yet?
Styracosaurus Winner of the "most elaborate head display" competition.
Styxosaurus This long-necked swimmer was a relative of Elasmosaurus.
Suchomimus A fish-eater with a distinctly crocodilian profile.
Supersaurus No, it didn't wear a cape--but this giant dino was still impressive.
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