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JAXARTOSAURUS
KENTROSAURUS
KOTASAURUS
KRITOSAURUS

 
JAXARTOSAURUS
Pronunciation: jax-AR-tuh-SAWR-us  
Translation: Jaxartes Lizard
(river in Kazakhstan, Russia)
Also known as:
Description: Herbivore,Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Hadrosauridae
Height: 16 feet (4.9 meters)
Length: 30 feet (9.1 meters)
Weight:
Period: Late Cretaceous


Notes: Fragmentary remains of Jaxartosaurus were discovered in Kazakhstan. Jaxartosaurus was an ornithischian similar to Hadrosaurus; however, its skull resembles that of Corythosaurus, with a smaller helmet-like crest. Jaxartosaurus' skull had a joint similiar to one found on modern crocodiles, a joint which may have acted as a shock absorber during sudden closing of its jaws.


KENTROSAURUS
Pronunciation: KEN-truh-SAWR-us  
Translation: Spiked Lizard
Also known as: Kentrurosaurus
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Stegosauria
Family: Stegosauridae
Height: 6 feet (1.8 meters)
Length: 18 feet (5.5 meters)
Weight: 4,000 pounds (1,814 kg)
Period: Late Jurassic


Notes: Kentrosaurus was discovered in Tanzania. A stegosaurid, it had paired plates that ran through the middle of its back. At midback, the plates were replaced by spikes that ran to the tip of its tail. Another pair of spikes jutted horizontally from its shoulders. Its feet were marked by claws that were more hoof-like than spiked. Males and females appear to have had differing numbers of ribs.


KOTASAURUS
Pronunciation: KOH-tuh-SAWR-us  
Translation: Kota (Formation) Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda or Prosauropoda
Family:
Height:
Length:
Weight:
Period: Early Jurassic


Notes: Kotasaurus may be the oldest sauropod, sharing the characteristics (mainly in the hip and pelvic region) of both prosauropods and sauropods.


KRITOSAURUS
Pronunciation: CRY-tuh-SAWR-us  
Translation: Noble Lizard
Also known as: Gryposaurus (not confirmed)
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Hadrosauridae
Height: 23 feet (7 meters)
Length: 30 feet (9.1 meters)
Weight: 5,950 pounds (2,700 kg)
Period: Late Cretaceous


Notes: Kritosaurus was found in New Mexico by Barnum Brown, the great American Museum of Natural History collector. This duckbill dinosaur had a wide, flat skull and a ridge of bone just below its eyes. This would have given its mouth and snout the appearance of a "Roman Nose," hence its name "Noble Lizard." There is considerable evidence that Kritosaurus and Gryposaurus are the same species but there appear to be differences in their tooth structure.



 

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