V >> Glossary Index
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Translation: Bulky Lizards
Hadrosaurinae (had-ruh-SAWR-i-nay) is a subfamily of Hadrosauridae. This
family of bipedal dinosaurs had slender legs and arms. They were marked
by low spines on their pelvic vertebrae. Also called the duck-bills, their
snouts were spoon-shaped. Their most striking feature was the crest that
adorned their heads. The hadrosaurines lived during the Late Cretaceous
Period and flourished in the lands of North America, Europe, and Asia.
Anatosaurus, Brachylophosaurus, Claosaurus, Mandschurosaurus, Hadrosaurus,
Translation: Duck-Billed Lizards
Hadrosauridae (had-ruh-SAWR-ih-day) is a family of commonly referred to
as "duck-billed dinosaurs." Bipedal, hadrosaurs could grow up
to 40 feet (12 meters) long. Their arms ended in webbed, four-fingered
hands. Typically they ate fruit and various sorts of vegetation. Typically
hadrosaurs are marked by a crest atop their heads, although some had none.
The crest was usually shaped like a long tube or a short hatchet. The dinosaurs
of the Hadrosauridae family lived during the Late Cretaceous Period. Anatosaurus,
Brachylophosaurus, and Saurolophus.
A dinosaur's front feet are usually referred to as hands. Because each
family of dinosaurs had distinctive hands, they are often used as clues
in determining to which dinosaur family fossilized remains belong. Ornithopods
typically had five-fingered hands whose bones resembled the arrangement
of human hands. The hands of the carnosaurs ranged from five-fingered to
two-fingered. The best-known carnosaur, Tyrannosaurus rex, had hands with
only two fingers each.
Translation: Harpy (mythical bird) Mimics
The Harpymimidae (hahr-pee-MYE-mi-day) is a family of ornithomimosaurid
(ostrich-like) theropods. Their hands were relatively large, their feet
were most likely three-toed, and they were evidently fast runners.
Judging from present-day reptiles, hearing among dinosaurs was probably
well-developed. Among some dinosaurs with little physical armor, such as
ornithopods, hearing was probably acute, since it would have been one of
the few defenses available to them. See also Sensory Perception.
Translation: Plant Eater
Herbivore (HER-bi-vor) is the name given to any animal that eats plants.
Herbivorous dinosaurs greatly outnumbered those that were carnivorous.
Ornithischians and sauropodomorphs were herbivores. See also Carnivore
A herd is an assembly of animals, which gathers for mutual protection against
predators. It appears that many species of dinosaurs traveled in herds;
their footprints have been discovered at trackways. Although the evidence
is debatable, it does appear from certain trackways that the adults of
some species forced their young to travel in the center of the herd, to
shield them from danger. It is worth noting that herding is associated
with warm-blooded animals, and this is one of the arguments used for dinosaurs
Translation: Herrera's Lizards
Herrerasauridae (her-ray-rah-SAWR-ih-day) is a family of ceratosaurs. This
family of dinosaurs lived during the Middle Triassic Period. They were
bipedal and quadrupedal, and the structure of their teeth indicates that
they were omnivorous.
Translation: Different Toothed Lizards
Heterodontosauridae (het-er-uh-don-tuh-SAWR-ih-day) is a family of very
small ornithopods. They are marked by their unusual teeth: in both upper
and lower jaws, they had canine teeth. Heterodontosaurids were bipedal
herbivores that lived during the Late Triassic Period.
Geranosaurus, Heterodontosaurus, and Lycorhinus.
Translation: Level Head
Homalocephalidae (ho-mah-luh-SEF-uh-lee-day) is a family of pachycephalosaurian
dinosaurs. These particular bone heads were small-to-medium in size, and
had flat bone heads (in contrast to their relatives, the dome-headed Pachycephalosauridae.)
Translation: Uniform Heat A homoiotherm is an animal whose internal temperature
remains at the same level no matter what the ambient temperature. These
animals are generally warm-blooded, but large cold-blooded animals would
have enough body mass to keep a fairly constant internal temperature. See
Ectotherm and Endotherm.
Dinosaurs with horns probably used them for defense against predators,
and they may have used them when fighting for mates or settling territorial
disputes with members of their own species. Dinosaur horns ranged from
little bumps to 2 feet- (61-cm) long nose horns. See Ceratopsians.
Translation: Huayang Lizards
Members of Huayangosauridae (hwah-YAHNG-o-SAW-ih-day) family are moderately-sized
forms of stegosaurs. They retain premaxillary teeth and show evidence of
two rows of small, paired dorsal plates. Their tails bore spikes.
Translation: High-Crested Tooth
Hypsilophodontidae (hip-sih-lo-fuh-DON-tih-day) is a family of small- to
medium-sized ornithopods. Hypsilophodonts were bipedal, with five fingers
and four toes, and herbivorous. It is thought that they were swift creatures.
They flourished during the Late Triassic and into the Cretaceous Periods.
Agilisaurus, Atlascopcosaurus, Hypsilophodon, Othnielia, Parksosaurus,