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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ARCHAEOPTERYX
Pronunciation:
ar-kee-OP-ter-ix 
Translation: Ancient Wing
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Maniraptora
(of the microorder Coelurosauria)
Family: Aves
Height: 1 foot (0.3 meters)
Length: 3 feet (0.9 meters)
Weight: 2 lbs (0.9 kg)
Period: Late Jurassic
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Notes: Identified by many as the first bird, Archaeopteryx resembles a
coelurosaur but was covered in feathers. (Its remains were found in fine
grained stone which still bore the clear impression of its feathers.) Archaeopteryx
was 3 feet (0.9 meters) long with sharp teeth, a long bony tail, and claw
fingers on its wings. The only known member of this family was discovered
in Bavaria, Germany. There is considerable debate whether Archaeopteryx
and Mononychus should be classified as dinosaurs.
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ARCHAEORNITHOIDES
Pronunciation:
AHR-kee-OR-ni-THOY-deez
Translation: First Bird
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Maniraptora
(of the microorder Coelurosauria)
Family: Archaeornithoididae
Height:
Length: 3.3 feet (1 meter)
Weight:
Period: Late Cretaceous
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Notes: Archaeornithoides is the among the smallest of dinosaurs. Many of
its bones resemble those of modern birds, hence its name, but the bones
also indicate a kinship with the troodontids and spinosaurids.
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ARCHAEORNITHOMIMUS
Pronunciation:
ar-kee-or-NITH-uh-my-mus
Translation: Ancient Bird Mimic
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Superfamily: Ornithomimosauria
(of the microorder Coelurosauria)
Family: Ornithomimidae
Height: 6 feet (1.8 meters)
Length: 11 feet (3.4 meters)
Weight: 200 pounds (90.7 kg)
Period: Late Cretaceous
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Notes: Found in China, Archaeornithomimus is the oldest ornithomimid or
ostrich mimic dinosaur. Unlike its later cousins which had three long fingers
on each hand Archaeornithomimus had a small, short third finger and all
the hand bones are much shorter than any other ornithomimid. This finding
has lead some scientists to question whether Archaeornithomimus is a true
ornithomimid or a new and as yet unidentified carnivorous dinosaur.
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ARGENTINOSAURUS
Pronunciation:
AHR-gen-TEEN-uh-SAWR-us
Translation:
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauridae
Height: 70 feet (21.4 meters)
Length: 120 feet (36.6 meters)
Weight: 220,000 lbs (99,792 kg)
Period: Late Cretaceous
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Notes: Argentinosaurus, recently discovered in Argentina, will probably
will turn out to be the largest dinosaur yet discovered, larger than Ultrasauros
or Seismosaurus. although Seismosaurus will likely continue to hold the
record for total length due to its extremely long tail, characteristic
of Diplodocidae. Scientists have prepared several vetabrae and the pelvis.
The cross section of one vertebra of Argentinosaurus measures over five
and one half feet in height.
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ARGYROSAURUS
Pronunciation:
ar-JYE-ruh-SAWR-us
Translation: Silver Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauridae (not confirmed)
Height: 25 feet (7.6 meters)
Length: 68.9 feet (21 meters)
Weight:
Period: Late Cretaceous
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Notes: Argyrosaurus was massive sauropod that lived in South America. Only
the legs and a few vertebrae have been recovered. Some scientists believe
that the remains found are of a large Antarctosaurus.
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ARRHINOCERATOPS
Pronunciation:
ah-RHINE-o-sair-a-tops
Translation: Without Nose Horned-Face
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Ceratopsia
Micro-order Neoceratopsia
Family: Ceratopsidae
Height: 7 feet (2.1 meters)
Length: 16 feet (4.9 meters)
Weight:
Period: Late Cretaceous
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Notes: Found in Alberta, Canada, this dinosaur had a neck shield that was
armed with spikes. It had a very short nose horn with two long, slightly
forward-curving brow horns.
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ATLASCOPCOSAURUS
Pronunciation:
AT-lus-KOP-kuh-SAWR-us
Translation: Atlas Copco
(drilling equipment corporation) Lizard
Also known as:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Family: Hypsilophodontidae
Height:
Length: 6.6 - 9.8 feet (2 - 3 meters)
Weight:
Period: Early Cretaceous
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Notes: Atlascopcosaurus is one of several small herbivorous dinosaurs discovered
in Australia.
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AUBLYSODON
Pronunciation:
oh-BLEEZ-uh-don
Translation: Backward Tooth
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Tyrannosauridae (not confirmed)
Subfamily: Aublysodontinae
Height:
Length: 15 feet (4.5 meters)
Weight:
Period: Late Cretaceous
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Notes: Named in the nineteenth century from fragmentary remains, Aublysodon
has had many unidentified fossils assigned to it. It may have been a tyrannosaurid.
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AUSTROSAURUS
Pronunciation:
OSS-tro-SAWR-us
Translation: Southern Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family:
Height: 30 feet (9.1 meters)
Length: 50 feet (15.2 meters)
Weight:
Period: Early Cretaceous
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Notes: Known from fragmentary remains, this primitive but large sauropod
was found in Australia, thus proving that sauropods lived in Australia
during the Cretaceous Period.
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AVACERATOPS
Pronunciation:
AV-uh-SER-uh-tops
Translation: Ava's Horned Face
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Ceratopsia
Micro-order Neoceratopsia
Family: Ceratopsidae
Height:
Length: 6.6 feet (2 meters)
Weight:
Period:
Late Cretaceous
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Notes: Compared to more well-known ceratopsians, who measured up to 30
feet (9 meters), Avaceratops was very small. In fact, some suggest that
it was actually a juvenile example of another species.
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AVIMIMUS
Pronunciation:
a-vih-MY-mus
Translation: Bird Mimic
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Superfamily: Ornithomimosauria (of the microorder Coelurosauria)
Family: Avimimidae
Height: 3.5 feet (1.1 meters)
Length: 5 feet (1.5 meters)
Weight:
Period: Late Cretaceous
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Notes: Fossils of Avimimus have been found in Mongolia and China. A small,
birdlike dinosaur, Avimimus was probably a swift runner, preying upon lizards
and insects. Although the idea is disputed, Avimimus may have had feathered
wings. It is distinct enough from other theropods to merit its own family.
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