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PACHYCEPHALOSAURUS
PACHYRHINOSAURUS
PANOPLOSAURUS
PARASAUROLOPHUS
PARKSOSAURUS
PATAGOSAURUS
PAWPAWSAURUS
PENTACERATOPS
PIATNITZKYSAURUS
PINACOSAURUS
PISANOSAURUS
PIVETEAUSAURUS
PLATEOSAURUS
PLEUROCOELUS
POEKILOPLEURON
PRENOCEPHALE
PROBACTROSAURUS
PROCOMPSOGNATHUS
PROSAUROLOPHUS
PROTOCERATOPS
PSITTACOSAURUS
 
PACHYCEPHALOSAURUS
Pronunciation: pak-ee-SEF-uh-lo-SAWR-us  
Translation: Thick-headed Lizard
Also Known As:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Pachycephalosauria
Family: Pachycephalosauridae
Height: 10 feet (3.1 meters)
Length: 18 feet (5.5 meters)
Weight: 4,000 pounds (1,814 kg)
Period: Late Cretaceous





Notes: Wart-like knobs and five-inch (13-cm) spikes fringed the ten-inch (25-cm) thick dome of Pachycephalosaurus, a rare dinosaur first discovered in Montana. It had a narrow face with leaf-shaped teeth and in all other respects it was like other ornithopods -- two-legged plant eaters with five-fingered hands, three-toed feet, and a long, heavy tail. Largest and last of the "bone-head" family, it and all its plant-eating relatives and carnivorous cousins became extinct 66 million years ago.


PACHYRHINOSAURUS
Pronunciation: PAK-ee-rye-no-SAWR-us  
Translation: Thick-nosed Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Ceratopsia
Micro-order Neoceratopsia
Family: Ceratopsidae
Height: 11 feet (3.5 meters)
Length: 23 feet (7 meters)
Weight: 8,000 pounds (3,630 kg)
Period: Late Cretaceous


Notes: Found in Alaska and Alberta, Canada, Pachyrhinosaurus had a large oval plate of bone on its nose instead of a horn. Rival males may have used their horns in butting combat to establish dominance within the herd. The horns may also have been used for defense against the carnosaurs that stalked them.


PANOPLOSAURUS
Pronunciation: pan-OP-luh-SAWR-us  
Translation: (Fully) Armored Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Nodosauridae
Height: 7 feet (2.1 meters)
Length: 23 feet (7 meters)
Weight: 6,000 pounds (2,720 kg)
Period: Late Cretaceous


Notes: Once thought to be the same as Edmontonia, it is probably a different genus. Panaoplosaurus and Edmontonia are found in Alberta, Canada, Montana and Texas. It had rows of thick bony plates which covered its pear-shaped head and its neck, back, and tail. Long spikes protected its sides and shoulders, but its tail, like those of all nodosaurids, was clubless. Panoplosaurus was one of the last of the North American nodosaurids.


PARASAUROLOPHUS
Pronunciation: par-ah-SAWR-OL-uh-fus  
Translation: Similar Crested Lizard, or beside Saurolophus
Also Known As:
Description:
Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Hadrosauridae
Height: 16 feet (4.9 meters)
Length: 33 feet (10.1 meters)
Weight: 6,000 - 8,000 pounds
(2,720 - 3,630 kg)
Period: Late Cretaceous





Notes: Parasaurolophus has been found in Utah, New Mexico, and Alberta, Canada.The remarkable crest of this duck-billed dinosaur was a hollow tube 5 feet (1.5 meters) long that extended back over the animal's shoulders. The purpose of this crest may have been to improve the dinosaur's sense of smell, or it may have served as a resonance chamber to allow for trumpetlike sounds.


PARKSOSAURUS
Pronunciation: PARKS-uh-SAWR-us  
Translation: Parks' Lizard
Also Known As:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Family: Hypsilophodontidae
Height: 4 feet 1.2 meters)
Length: 7 feet (2.1 meters)
Weight: 150 pounds (68 kg)
Period: Late Cretaceous


Notes: Found in Montana and Alberta, Canada, Parksosaurus had a long neck and small head with a horny beak. Its forelimbs were short and strong. It ran on hind legs but may have grazed on all four limbs. Named for W.A. Parks, Canadian dinosaur collector and researcher.


PATAGOSAURUS
Pronunciation: PAT-uh-go-SAWR-us  
Translation: Patagonian Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Cetiosauridae
Height: 24 feet (7.3 meters)
Length: 50 feet (15.2 meters)
Weight: Period: Middle Jurassic


Notes: Patagosaurus was a cetiosaurid about the same size and shape as Cetiosaurus, but more primitive. It was also more primitive than Haplocanthosaurus but more advanced than Amygdalodon. Patagosaurus is named for the area in Argentina where it was found.


PAWPAWSAURUS
Pronunciation: PAH-pah-SAWR-us  
Translation: Paw Paw (from the eastern Texas
Paw Paw rock formation) Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Nodosauridae
Height: 6 feet (1.8 meters)
Length: 20 feet (6.1 meters)
Weight: 4,000 pounds (1,814 kg)
Period: Late Cretaceous


Notes: Pawpawsaurus was named for the eastern Texas Paw Paw rock formation in which it was discovered in 1989 by 12-year-old Johnny Maurice. This specimen found represents the only baby nodosaur fossil discovery. Pawpawsaurus, like other armored nodosaurs, resembled large modern armadillos, which roam the Texas plains today. In the same Paw Paw formation, near where the baby nodosaur was discovered, a nearly complete skull of an adult Pawpawsaurus was discovered.


PENTACERATOPS
Pronunciation: PEN-tah-sair-uh-tops  
Translation: Five-horned Face
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Ceratopsia
Micro-order Neoceratopsia
Family: Ceratopsidae
Height: 11 feet (3.4 meters)
Length: 24.6 feet (7.5 meters)
Weight: 13,000 pounds (5,897 kg)
Period: Late Cretaceous


Notes: Pentaceratops was discovered in New Mexico. A long-frilled ceratopsian related to Chasmosaurus, Pentaceratops had two long brow horns, a shorter nose-horn, and two additional horn-like growths, one on each cheek. It had more horns than any other horned dinosaur. Its head (including the frill) was 7.5 feet ( 2.3 meters) long, more than one-third as long as its body.


PIATNITZKYSAURUS
Pronunciation: pee-aht-NIT-skee-SAWR-us  
Translation: Piatnitzky's Lizard
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Allosauridae
Height: 7 feet (2.1 meters)
Length: 14 feet (4.3 meters)
Weight:
Period: Late Jurassic


Notes: Found in Argentina, Piatnitzkysaurus is the earliest known carnosaur. Related to Allosaurus, but smaller and more primitive, with longer arms, it lived 15 million years before its better-known relative.


PINACOSAURUS
Pronunciation: PIN-uh-kuh-SAWR-us  
Translation: Broad Lizard
Also Known As: Syrmosaurus
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Ankylosauridae
Height: 4 feet (1.2 meters)
Length: 11.5 feet (3.5 meters)
Weight:
Period: Late Cretaceous


Notes: Found in Mongolia and China, Pinacosaurus was related to Ankylosaurus. It had sharp spikes along its back and sides, and its tail ended in a flat bone with sharp edges resembling a double-edged stone ax. Pinacosaurus is one of the relatively small number of dinosaurs whose young have been found: more than a dozen baby pinacosaurs were found under a dune in the Gobi desert, huddled together for protection.


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