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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
 
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





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.


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


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.


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


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.


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


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.


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


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.


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


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.


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


Notes: Atlascopcosaurus is one of several small herbivorous dinosaurs discovered in Australia.


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


Notes: Named in the nineteenth century from fragmentary remains, Aublysodon has had many unidentified fossils assigned to it. It may have been a tyrannosaurid.


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


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.


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


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.


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


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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