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ACANTHOPHOLIS
ACROCANTHOSAURUS
ADASAURUS
AEGYPTOSAURUS
AEOLOSAURUS
AFROVENATOR
AGILISAURUS
ALAMOSAURUS
ALBERTOSAURUS
ALECTROSAURUS
ALGOASAURUS
ALIORAMUS
ALLOSAURUS
ALTISPINAX
ALVAREZSAURUS
ALXASAURUS
AMARGASAURUS
AMMOSAURUS
AMTOSAURUS
AMYGDALODON
ANATOTITAN
ANCHICERATOPS
ANCHISAURUS
ANDESAURUS
ANKYLOSAURUS
ANSERIMIMUS
ANTARCTOSAURUS
ANTRODEMUS
APATOSAURUS
ARALOSAURUS
ARCHAEOPTERYX
ARCHAEORNITHOIDES
ARCHAEORNITHOMIMUS
ARGENTINOSAURUS
ARGYROSAURUS
ARRHINOCERATOPS
ATLASCOPCOSAURUS
AUBLYSODON
AUSTROSAURUS
AVACERATOPS
AVIMIMUS
 
ACANTHOPHOLIS
Pronunciation: a-kan-THOF-o-liss  
Translation: Spine Bearer
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Nodosauridae
Height: 6 feet (1.8 meters)
Length: 18 feet (5.5 meters)
Weight:
Period: Early-Late Cretaceous


Notes: Fragmentary remains were discovered in England. Because its remains are distributed among several museums, it is difficult now to form an accurate picture of its appearance. Acanthopholis was one of the armored dinosaurs. The shoulders and neck of its slender body were armed with spikes. Possibly too fragmentary to base the genus on.


ACROCANTHOSAURUS
Pronunciation: ak-ro-KANTH-uh-SAWR-us 
Translation: High Spine Lizard
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Allosauridae(not confirmed)
Height: 18 feet (5.5 meters)
Length: 40 feet (12.2 meters)
Weight: 4,000 - 6,000 lbs (1,814 - 2,722 kg)
Period: Early Cretaceous


Notes: Acrocanthosaurus is one of the few allosaurids known to North America, with fragmentary remains having been found in Texas and Oklahoma. Its back was marked by spines of up to 2 feet (60 cm) high in large specimens. Unlike the spines in other dinosaurs, those in Acrocanthosaurus were thickly covered with muscle, and it is unlikely that this ridge was used for cooling. (Compare Spinosaurus) It is estimated that Acrocanthosaurus could run as fast as 25 mph (40 km/h).


ADASAURUS
Pronunciation: AD-uh-SAWR-us 
Translation: Ada
(an evil spirit from Mongolian mythology) Lizard
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Maniraptora
(of the microorder Coelurosauria)
Family: Dromaeosauridae
Height:
Length: 6 feet (1.8 meters)
Weight: 33 lbs (15 kg)
Period: Late Cretaceous


Notes: As in other dromaeosaurs, the Adasaurus' hip bone is arranged more like that of an ornithischian than other saurischians. Adasaurus had a "switchblade" toe claw similar to, but smaller than those of other dromaeosaurids like Deinonychus and Velociraptor.


AEGYPTOSAURUS
Pronunciation: ee-JIP-tuh-SAWR-us 
Translation: Egyptian Lizard
Also known as:
Description: Herbivore,Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Diplodocidae
Height: 21 feet (6.4 meters)
Length: 52.5 feet (16 meters)
Weight: Period: Late Cretaceous


Notes: Fragmentary remains of Aegyptosaurus were discovered in Egypt and showed it to be very similar to Diplodocus. Unfortunately, even the fragmentary remains were lost during an air raid in World War II.


AEOLOSAURUS
Pronunciation: ee-OH-luh-SAWR-us 
Translation: Wind Lizard
Also known as:
Description: Herbivore,Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauridae
Height: Length: 49.1 feet (15 meters)
Weight:
Period: Late Cretaceous


Notes: Aeolosaurus was a sauropod common to the southern hemisphere during the Late Cretaceous Period. It is similar to Titanosaurus, but has unusual tail vertebrae with long, forward-pointing barbs.


AFROVENATOR
Pronunciation: AF-roh-VEN-uh-tehr 
Translation: African Hunter
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family:
Height: 10 feet (3.0 meters)
Length: 29.5 feet (9 meters)
Weight: 3,000 pounds (1,361 kg)
Period: Early Cretaceous


Notes: Discovered in Niger in the southern Sahara Desert in Africa, Afrovenator shows some similarities in appearance to Torvosaurus; e.g. similar forelimbs. It possessed 14 blade-shaped teeth. Known from a partial skeleton and a nearly complete skull, Afrovenator was an exciting find because dinosaur fossils are scarce in northern Africa.


AGILISAURUS
Pronunciation: uh-JIL-uh-SAWR-us 
Translation: Nimble Lizard
Also known as:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Family: Hypsilophodontidae
Height:
Length: 3.5 - 4 feet (1.2 - 1.7 meters)
Weight:
Period: Middle Jurassic


Notes: Most of what is known of Agilisaurus comes from a fossilized skeleton excavated from the Dashanpu quarry in Sichuan, China. The size and strength of its hind leg bones suggest this dinosaur was a fast runner (hence its name).


ALAMOSAURUS
Pronunciation: AL-uh-mo-SAWR-us 
Translation: Alamo Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauridae
Height: 28 feet (8.5 meters)
Length: 69 feet (21 meters)
Weight: 60,000 lbs (27,216 kg)
Period: Late Cretaceous


Notes: Found in New Mexico, Texas and Utah, Alamosaurus is North America's only titanosaurid and one of the last sauropods living at the end of the Age of Dinosaurs. It may have come to North America from South America where sauropods, titanosaurs in particular, remained abundant throughout the Cretaceous Period. Although its name suggests an event in Texas history, Alamosaurus was named for the Ojo Alamo trading post in New Mexico.


ALBERTOSAURUS
Pronunciation: al-BER-tuh-SAWR-us 
Translation: Alberta Lizard
Also known as: Gorgosaurus, Deinodon
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Tyrannosauridae
Height: 15 feet (4.5 meters)
Length: 30 feet (11 meters)
Weight: 6,000 lbs (2,722 kg)
Period: Late Cretaceous


Notes: First discovered in Alberta, Canada, Albertosaurus stalked its prey almost 8 million years before Tyrannosaurus, a close relative. It had a huge head with long, sharp, saw-toothed teeth and two-fingered hands on arms that were longer than Tyrannosaurus's stubby forelimbs. With its sleek build and long hind limbs, it was one of the fastest runners among the tyrannosaurids. A jaw and teeth belonging to an Albertosaurus were identified by Joseph Leidy, who named the first American dinosaurs (see Deinodon).


ALECTROSAURUS
Pronunciation: ah-LEK-truh-SAWR-us 
Translation: Unmarried Lizard
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Tyrannosauridae
Height: 7 feet (2.1 meters)
Length: 16 feet (4.9 meters)
Weight: less than 1,000 lbs (454 kg)
Period: Late Cretaceous


Notes: A small tyrannosaurid whose teeth were short but very sharp. Its hind legs were slender, as opposed to its thick-thighed relatives. It is known from fragments found in Mongolia.


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