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SAICHANIA
SALTASAURUS
SALTOPUS
SARCOLESTES
SARCOSAURUS
SAUROLOPHUS
SAUROPELTA
SAUROPLITES
SAURORNITHOIDES
SAURORNITHOLESTES
SCELIDOSAURUS
SCUTELLOSAURUS
SECERNOSAURUS
SEGISAURUS
SEGNOSAURUS
SEISMOSAURUS
SHAMOSAURUS
SHANSHANOSAURUS
SHANTUNGOSAURUS
SILVISAURUS
SINOSAURUS
SPINOSAURUS
STAURIKOSAURUS
STEGOCERAS
STEGOSAURUS
STENOPELIX
STOKESOSAURUS
STRUTHIOMIMUS
STRUTHIOSAURUS
STYGIMOLOCH
STYRACOSAURUS
SUPERSAURUS
SYNTARSUS
 
STAURIKOSAURUS
Pronunciation: stor-IK-uh-SAWR-us  
Translation: (Southern) Cross Lizard
Also Known As:
Description: Carnivore, Bipedal
Superorder: Dinosauria
Order: Saurischia (not confirmed)
Suborder: Theropoda (not confirmed)
Family:
Height: 2.5 feet (0.8 meters)
Length: 6 feet (1.8 meters)
Weight: 66 pounds (30 kg)
Period: Late Triassic


Notes: Found in southern Brazil and Argentina, Staurikosaurus is one of the earliest known and most primitive dinosaurs. It appears to predate the saurischian and ornithiscian orders, having characteristics of neither. However, new studies suggest that Staurikosaurus, Eoraptor and Herrerasaurus are definite theropods and probably do not predate a split between the two orders.


STEGOCERAS
Pronunciation: steg-OSS-er-us  
Translation: Covered horn, or Horny Roof
Also Known As:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Pachycephalosauria
Family: Pachycephalosauridae
Height: 3.5 feet (1.1 meters)
Length: 6 feet (1.8 meters)
Weight: 100 pounds (45.4 kg)
Period: Late Cretaceous





Notes: First discovered in Montana and Alberta, Canada, Stegoceras is the best known of all North American "bone-head" dinosaurs. The relatively large brain of this dinosaur was encased in a dome of 3 inches (7.6 cm) thick bone divided into two parts. The males had larger and thicker domes than the females. Small spikes fringed the back of the head. Stegoceras males may have butted competing males for mating territory but it is unlikely that they butted heads as commonly portrayed.


STEGOSAURUS
Pronunciation: STEG-uh-SAWR-us  
Translation: Roof Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Stegosauria
Family: Stegosauridae
Height: 14 feet (4.3 meters)
Length: 28 feet (8.5 meters)
Weight: 6,000 pounds (2,722 kg)
Period: Late Jurassic


Notes: Stegosaurus is the only plated dinosaur ever found in western North America. The large triangular plates that ran along its back were probably arranged in a double row, and its tail was armed with four long spikes. The plates may have served the purpose of regulating Stegosaurus' internal temperature, dissipating heat when turned from the sun, absorbing heat when faced into the sun. The size of plates may also have made Stegosaurus appear larger to predators and served to deter them from attacking.


STENOPELIX
Pronunciation: sten-uh-PAY-lix  
Translation: Narrow Helmet, or Narrow Pitcher
Also Known As:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Marginocephalia
Family:
Height: 2.5 feet (.76 meters)
Length: 5 feet (1.5 meters)
Weight:
Period: Early Cretaceous
     

Notes: Discovered in Germany, Stenopelix had a narrow parrot-like beak.


STOKESOSAURUS
Pronunciation: STOKES-uh-SAWR-us  
Translation: Stokes's Lizard
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria (not confirmed)
Family:
Height: 7 feet (2.1 meters)
Length: 13 feet (4 meters)
Weight:
Period: Late Jurassic


Notes: This dinosaur may have been related to the tyrannosaurid Albertosaurus. It was discovered in Utah and named for Lee Stokes, American paleontologist.


STRUTHIOMIMUS
Pronunciation: strooth-ee-uh-MY-mus  
Translation: Ostrich Mimic
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Superfamily: Ornithomimosauria
(of the microorder Coelurosauria)
Family: Ornithomimidae
Height: 7 feet (2.1 meters)
Length: 12 feet (3.7 meters)
Weight:
Period: Late Cretaceous


Notes: Found in Alberta, Canada, Struthiomimus is the best known of all ornithomimids. Like other ornithomimids, Struthiomimus was built for speed, with large hind legs and a tail that could be stiffened to provide balance and the ability to make quick turns. It had no teeth, but it is still a carnivore eating soft foods such as eggs, insects, and small animals.


STRUTHIOSAURUS
Pronunciation: STROOTH-ee-o-SAWR-us  
Translation: Harsh Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Nodosauridae
Height: 1.5 feet (.46 meters)
Length: 5 (1.5 meters)
Weight:
Period: Late Cretaceous


Notes: Found in Austria, Struthiosaurus is the smallest known ankylosaur. Its head had no armor; however, its sides were probably well protected.


STYGIMOLOCH
Pronunciation: STIG-ih-MOE-lock  
Translation: Demon from the River Styx
Also known as:
Description: Herbivore, Bipedaly
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Pachycephalosauria
Family: Pachycephalosauridae
Height: 4 feet (1.2 meters)
Length: 6.6 feet (2 meters)
Weight:
Period: Late Cretaceous


Notes: Stygimoloch received its name from the unusual appearance of its skull, which is adorned with three or four massive spikes, the largest of which was about 4 inches (100 mm) long. Like other pachycephalosaurs, Stygimoloch may have used its horns in butting heads with rivals, like present-day Bighorn sheep.


STYRACOSAURUS
Pronunciation: stih-RAK-uh-SAWR-us  
Translation: Spiked Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Ceratopsia
Micro-order Neoceratopsia
Family: Ceratopsidae
Height: 9 feet (2.7 meters)
Length: 17 feet (5.2 meters)
Weight: 6,000 lb (2,722 kg)
Period: Late Cretaceous





Notes: Found in Alberta, Canada, Styracosaurus was a short-frilled ceratopsian with 6 long spikes along the edge of its frill. Its snout was shaped like a parrot's beak. And on its snout grew a horn that was nearly 2 feet (0.6 meters) long and 6 inches (15 cm thick). Possibly it used this great horn for self-defense.


SUPERSAURUS
Pronunciation: SOO-per-SAWR-us  
Translation: Super Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Diplodocidae
Height: 65 feet (20 meters)
Length: 120 feet (36.6 meters)
Weight: 120,000 pounds (54,432 kg)
Period: Late Jurassic


Notes: An immense dinosaur found in Colorado in 1972 by "Dinosaur Jim" Jensen, Supersaurus had a 39-foot long neck. Most notable about the rather incomplete material is a scapula or shoulder bone 8 feet long, which suggests an overall height of 65 feet. Supersaurus is a diplodocid, characterized by a long, narrow head, very long neck, and a tail that ended in a tapering whiplash. The same quarry that produced Supersaurus also produced Ultrasauros.


SYNTARSUS
Pronunciation: sin-TAR-sus  
Translation: Fused Ankle
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Ceratosauria
Family: Podokesauridae
Height: 4.5 feet (1.4 meters)
Length: 9.8 feet (3 meters)
Weight: 65 pounds (29.5 kg)
Period: Early Jurassic


Notes: Found in Zimbabwe and Arizona, Syntarsus was a slender predator with short arms and long legs with fused foot bones. Related to Coelophysis.


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