PACHYCEPHALOSAURUS
PACHYRHINOSAURUS
PANOPLOSAURUS
PARASAUROLOPHUS
PARKSOSAURUS
PATAGOSAURUS
PAWPAWSAURUS
PENTACERATOPS
PIATNITZKYSAURUS
PINACOSAURUS
PISANOSAURUS
PIVETEAUSAURUS
PLATEOSAURUS
PLEUROCOELUS
POEKILOPLEURON
PRENOCEPHALE
PROBACTROSAURUS
PROCOMPSOGNATHUS
PROSAUROLOPHUS
PROTOCERATOPS
PSITTACOSAURUS
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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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