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
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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
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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.
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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
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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).
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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).
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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
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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.
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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
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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).
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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
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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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