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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
 
ALGOASAURUS
Pronunciation: al-GO-uh-SAWR-us 
Translation: Algoa Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family:
Height:
Length: 29.5 feet (9 meters)
Weight: Period: Early Cretaceous


Notes: Known only from fragmentary remains found only in South Africa, Algoasaurus was probably less than half the size as Diplodocus. Discovered, as are so many dinosaurs, in a quarry, Algoasaurus suffered the indignity of having most of its skeleton, unrecognized by the quarrymen, pulverized to make brick.


ALIORAMUS
Pronunciation: ah-lee-o-RAH-mus 
Translation: Other Branch
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Tyrannosauridae
Height: 11 feet (3.4 meters)
Length: 20 feet (6.1 meters)
Weight: 1,500 lbs (680 kg)
Period: Late Cretaceous


Notes: Alioramus had a longer head and smaller and more numerous teeth than other tyrannosaurids. It was small and slender and it possessed six small horns on its long snout, two side by side and four in a single row ahead of them. Too small for defensive purposes, these horns may have been secondary sexual characteristics, identifying males and females. Fossils of this dinosaur were found in Mongolia.


ALLOSAURUS
Pronunciation: AL-uh-SAWR-us 
Translation: Other Lizard
Also known as: Antrodemus, Creosaurus
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Carnosauria
Family: Allosauridae
Height: 17 feet (5.2 meters)
Length: 40 feet (12.2 meters)
Weight: 4,000 lbs (1,814 kg)
Period: Late Jurassic





Notes: Allosaurus is one of the best known carnosaurs. Sixty individuals, from juveniles to adults, were found at one site in Utah. It is likely that Allosaurus may have been the most common carnosaur of the Late Jurassic. Despite its size, Allosaurus is thought to have been a speedy hunter, running with a 3.7-meter-long stride at up to 20 mph. Its most distinguishing characteristic is the presence of two short horns, above and in front of each eye.


ALTISPINAX
Pronunciation: al-tuh-SPY-nax 
Translation: High Spines
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Family: (Not confirmed)
Height: 11 feet (3.4 meters)
Length: 26.2 feet (8 meters)
Weight:
Period: Early Cretaceous


Notes: Fragmentary remains of Altispinax have been discovered in England and Germany. Only some worn teeth and three mid-back vertebrae are known. On these vertebrae were long projections similar to, but shorter than, those of Spinosaurus.


ALVAREZSAURUS
Pronunciation: AL-vuh-rez-SAWR-us 
Translation: Alvarez
(Don Gregorio Alvarez) Lizard
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Micro-order: Alvarezsauria
(of the microorder Coelurosauria)
Family: Alvarezsauridae
Height: 2 feet (0.6 meters)
Length: 4.6 feet (1.4 meters)
Weight: 6.6 lbs (3 kg)
Period: Late Cretaceous


Notes: Discovered in Neuquen, Argentina, the remains of Alvarezsaurus did not include a skull or forelimbs. A small animal, it was lightly built with long legs, suggesting that it could run quickly. One odd characteristic of this genus is the lack of spines on the neck vertebrae. Some scientists believe Alvarezsaurus is related to the Mongolian Mononychus.


ALXASAURUS
Pronunciation: AL-shuh-SAWR-us 
Translation: Alxa
(Alxa Desert of Inner Mongolia) Lizard
Also known as:
Description: Herbivore, mostly Bipedal?
Order: Saurischia
Suborder: Theropoda
Infraorder: Therizinosauroidea
Family: Alxasaururidae
Height: 5.75 feet (1.75 meters)
Length: 13 feet (4 meters)
Weight:
Period: Early-Late Cretaceous


Notes: This unusual dinosaur is the earliest known Segnosaur. It is characterized by its large arms and claws. It closely resembled Erlikosaurus in structure; one of the more notable anatomical differences being a greater number of teeth possessed by Alxasaurus vs. 31 in Erlikosaurus. While it had a toothless beak, these tiny, leaf-shaped teeth were placed further back in the mouth and are usually interpreted as being those of a herbivore.


AMARGASAURUS
Pronunciation: ah-MAR-guh-SAWR-us 
Translation: (La) Amarga (Argentina) Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Diplodocidae
Height:
Length: 33 feet (10 meters)
Weight:
Period: Late Jurassic


Notes: Discovered in Argentina, Amargasaurus is known from fragmentary remains. It is similar to the diplodocid family of dinosaurs. It is distinguished from all other sauropods by the presence of elongated spines running from its neck to its tail. The spines are paired, and it may be that they supported not one but two sails. Amargasaurus' sail or sails would have increased its body surface and allowed it to dissipate excess body heat.


AMMOSAURUS
Pronunciation: AM-uh-SAW-rus 
Translation: Sandy Ground Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Prosauropoda
Family: Plateosauridae
Height: 6 feet (1.8 meters)
Length: 14 feet (4.3 meters)
Weight:
Period: Early Jurassic


Notes: A medium-sized member of the prosauropod family, this primitive plant-eater was characterized by a small head, long neck and large body. Discovered in a quarry in Connecticut in the late 1800's, only the back half of the specimen was rescued by Othniel Charles Marsh; the front half having already been sawed into blocks to build a bridge near South Manchester. In 1969, more parts of the Ammosaurus were discovered when a nearby sandstone bridge was demolished.


AMTOSAURUS
Pronunciation: AM-toe-SAWR-us 
Translation: Amtgay (Mongolia) Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Ankylosauridae (not confirmed)
Height:
Length: 23 feet (7 meters)
Weight:
Period: Late Cretaceous


Notes: As only a braincase has been found, it may not be an ankylosaur. If it is an ankylosaur, Amtosaurus was covered with bony armor plates.


AMYGDALODON
Pronunciation: ah-MIG-duh-lo-don 
Translation: Almond Tooth
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Cetiosauridae
Height:
Length: 40-50 feet (12-15 meters)
Weight:
Period: Middle Jurassic


Notes: Known from fragmentary remains, Amygdalodon is one of the only known Jurassic dinosaurs from South America. As a sauropod, it would have been large, and it possessed a long neck.


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