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HADROSAURUS
HALTICOSAURUS
HAPLOCANTHOSAURUS
HARPYMIMUS
HEPTASTEORNIS
HERRERASAURUS
HETERODONTOSAURUS
HOMALOCEPHALE
HOPLITOSAURUS
HUAYANGOSAURUS
HYLAEOSAURUS
HYPACROSAURUS
HYPSELOSAURUS
HYPSILOPHODON

 
HADROSAURUS
Pronunciation: HAD-ruh-SAWR-us  
Translation: Sturdy Lizard
Also known as:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Hadrosauridae
Height: 15 feet (4.6 meters)
Length: 28 feet (8.5 meters)
Weight: 6,000 pounds (2,722 kg)
Period: Late Cretaceous


Notes: Hadrosaurus was the first dinosaur known from a nearly complete skeleton. Its beak-shaped snout had no teeth; however, it had batteries of plant-grinding teeth in its jaws.


HALTICOSAURUS
Pronunciation: HALT-ih-kuh-SAWR-us  
Translation: Leaping Lizard
Also known as: Coelurosaur
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda (not confirmed)
Family:
Height: 8 feet (2.4 meters)
Length: 18 feet (5.5 meters)
Weight:
Period: Late Triassic


Notes: This small dinosaur was one of the first known theropods, discovered in southern Germany in 1906.


HAPLOCANTHOSAURUS
Pronunciation: hap-low-KANTH-uh-SAWR-uss  
Translation: Single-Spined Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Cetiosauridae
Height: 35 feet (10.7 meters)
Length: 72 feet (21.9 meters)
Weight: 45,000 pounds (20,412 kg)
Period: Late Jurassic


Notes: Haplocanthosaurus is the most primitive sauropod yet discovered in North America and the only known representative of the basal sauropods of the group Cetiosauridae. Found in Colorado, Wyoming and Utah, this giant, four-legged browsing dinosaur had solid, single-spined vertebrae, and a short neck and tail. Although known for nearly a century, recent finds have established it as a far larger animal than first thought.


HARPYMIMUS
Pronunciation: HAHR-pee-MYE-mus  
Translation: Harpy (mythological bird) Mimic
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae
Superfamily: Ornithomimosauria (of the microorder Coelurosauria)
Family: Harpymimidae
Height:
Length: 12 feet (3.6 meters)
Weight:
Period: Early Cretaceous


Notes: Harpymimus is the earliest and most primitive ornithomimid, or ostrich-mimic. Because it possessed teeth, and later ornithomimids did not, Harpymimus represents an important bridge between earlier theropods and later ornithomimids.


HEPTASTEORNIS
Pronunciation: hep-TAS-tee-OR-nis  
Translation: Seven Towns Bird
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Tetanurae (not confirmed)
Micro-order: Maniraptora (of the microorder Coelurosauria)
Family: Tro”dontidae
Height:
Length:
Weight:
Period: Late Cretaceous


Notes: Because it is only known from parts of leg bones, this small theropod was first taken to be a large bird and later, more specifically, a large owl (hence its name).


HERRERASAURUS
Pronunciation: her-RARE-uh-SAWR-us  
Translation: Herrera Lizard
Also known as:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Ceratosauria
Family: Herrerasauridae
Height: 7 feet (2.1 meters)
Length: 15 feet (4.6 meters)
Weight:
Period: Late Triassic


Notes: Found in northwest Argentina, Herrerasaurus is one of the earliest known dinosaurs, a primitive carnivore. Herrerasaurus had four-toed feet and hip bones with both saurischian and ornithischian features. Its jaws were double-hinged to allow it to scoop large chunks of meat from its prey. Its skeleton was discovered headless and it was 30 years before a skull specimen was found.


HETERODONTOSAURUS
Pronunciation: het-er-uh-DON-tuh-SAWR-us  
Translation: Different-Toothed Lizard
Also known as:
Description: Herbivore, Bipedal, semi Quadrupedal
Order: Ornithischia
Suborder: Ornithopoda
Family: Heterodontosauridae
Height: 18 inches (0.45 meters)
Length: 40 inches (0.9 meters)
Weight: 10 pounds (4.5 kg)
Period: Early Jurassic


Notes: Found in southern Africa, Heterodontosaurus was a small, primitive dinosaur with large eyes above a short face and an odd assortment of teeth that inspired its name "different-toothed lizard". It had three kinds of teeth: molars, canine, and upper front teeth that bit against a horny beak. Heterodontosaurus was probably a plant-eater. When foraging, it may have dropped to all fours and used its long slender fingers for grasping or digging.


HOMALOCEPHALE
Pronunciation: ho-mah-luh-SEF-uh-lee  
Translation: Level Head
Also known as:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Pachycephalosauria
Family: Homalocephalidae
Height: 2.5 feet (0.8 meters)
Length: 4.9 feet (1.5 meters)
Weight: Period: Late Cretaceous


Notes: Homalocephale was discovered in China and Mongolia. A member of the "bone-headed" group of dinosaurs, Homalocephale probably battled like species for mates or territory by butting its head against the heads of other males. It had a knobbed, thick, flat skull and short arms with five-fingered hands for grasping food.


HOPLITOSAURUS
Pronunciation: hop-LEE-tuh-SAWR-us  
Translation: Armed Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Nodosauridae
Height: 5 feet (1.5 meters)
Length: 14.5 feet (4.4 meters)
Weight: Period: Early Cretaceous


Notes: Discovered in South Dakota, Hoplitosaurus was protected by flat, round, spined and triangular armor plating.


HUAYANGOSAURUS
Pronunciation: hwah-YAHNG-o-SAWR-us  
Translation: Huayang Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Stegosauria
Family: Huayangosauridae
Height: 6 feet (1.8 meters)
Length: 13.1 feet (4 meters)
Weight: 3,000 pounds (1,360 kg)
Period: Middle Jurassic


Notes: This dinosaur was discovered in China. One of the oldest stegosaurs known, it had plates, spines, and front teeth rather than a toothless beak.


HYLAEOSAURUSS
Pronunciation: hy-LAY-uh-SAWR-us  
Translation: Woodland Lizard
Also known as: Polacanthus and Polacanthoides
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Nodosauridae
Height: 6 feet (1.8 meters)
Length: 15 feet (4.6 meters)
Weight:
Period: Early Cretaceous


Notes: Hylaeosaurus had rows of horny, triangular-shaped spines running down its back. For further protection against predators, its hips were covered with a bony plate. Hylaeosaurus is one of the first three dinosaurs to be named, the other two being Iguanodon and Megalosaurus.


HYPACROSAURUS
Pronunciation: hye-PACK-ruh-SAWR-us  
Translation: Very High Lizard
Also known as: Cheneosaurus
Description: Herbivore, Bipedal, semi Quadrupedal
Order: Ornithischia
Suborder: Ornithopoda
Infraorder: Iguanodontia
Family: Hadrosauridae
Height: 12 feet (3.7 meters)
Length: 30 feet (9.1 meters)
Weight:
Period: Late Cretaceous


Notes: A high ridge on its back might have served as a radiator, helping Hypacrosaurus to regulate its internal temperature. This dinosaur lived in western United States and Canada. Eggs and babies of this animal have also been found.


HYPSELOSAURUS
Pronunciation: HIP-sih-luh-SAWR-us  
Translation: Above Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauridae
Height: 14 feet (4.3 meters)
Length: 40 feet (12.2 meters)
Weight: 20,000 pounds (9,070 kg)
Period: Late Cretaceous


Notes: Hypselosaurus lived in Spain and France. It laid its eggs in small craters. The eggs, over twice the size of ostrich eggs, are remarkable for their nearly spherical shape. Each egg was about 12 inches (30 cm) in diameter and could hold a volume of about 1/2 gallon (2 liters). Hypselosaurus resembled Titanosaurus. It should be noted, however, that the eggs found were not conclusively determined to be from Hypselosaurus.


HYPSILOPHODON
Pronunciation: hip-sih-LO-fuh-don  
Translation: High-Ridge Tooth
Also known as:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Ornithopoda
Family: Hypsilophodontidae
Height: 4 feet (1.2 meters)
Length: 7.5 feet (2.3 meters)
Weight: 140 pounds (64 kg)
Period: Early Cretaceous


Notes: Hypsilophodon was the fastest of the ornithischians that lived in central United States, England, Spain and Portugal. Its snout ended in a beak, but it had teeth at the rear of its mouth. Hypsilophodon was once thought to have lived in trees, though this has since been disproven.



 

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