home *** CD-ROM | disk | FTP | other *** search
- HADROSAURINE: Non-crested
- hadrosaurid.
-
- HADROSAURS: The duck-billed
- dinosaurs. They are composed of two
- groups, the hadrosaurines or flat-headed
- duckbills, and the lambeosaurines or
- crested duckbills. The hadrosaurs were
- one of the only groups of dinosaurs to
- shred food like mammals in the zone of
- occlusion where the teeth came together
- in a large grinding motion.
-
- HADROSAURUS: [Had-roe-SOAR-uss]
- "Sturdy Reptile." Late Cretaceous,
- duck-billed, ornithopod dinosaur.
- Possessed the following traits:
- bipedal/quadrupedal; herbivorous; and
- "Roman-nosed." The first dinosaur in
- North America to be scientifically
- described. Up to 32 feet long. Found in
- New Jersey.
-
- HAPLOCANTHOSAURUS: [Hap-low-
- Kanth-oh-SOAR-uss] "Single-spined
- Reptile." Late Jurassic sauropod.
- Herbivorous, quadrupedal dinosaur
- reaching a length of up to 72 feet. Found
- in western North America. [Colorado;
- Wyoming]
-
- HERBIVORE: An organism that consumes
- living plants or their parts.
-
- HERRERASAURUS: [hair-REHR-rah-
- Soar-uss] "Herrera's Reptile." One of
- the earliest-known dinosaurs. A
- bipedal, late Triassic, flesh-eating
- theropod. Up to ten feet in length. Found
- in Argentina.
-
- HETERODONTOSAURUS: [Hett-err-oh-
- Don-toe-SOAR-uss] "Different-toothed
- Reptile." Early Jurassic, ornithopod
- dinosaur. Bipedal herbivore not quite 4
- feet long. The jaws had three types of
- teeth: small, sharp, cutting teeth; short
- curved tusks (perhaps in males only);
- and close-packed shearing teeth that
- acted side to side as well as up and
- down. Found in South Africa.
-
- HIERARCHY: A body of persons or
- things, which are grouped in successive
- or inclusive categories, according to
- their rank.
- HINDLIMBS: The back or rear legs of an
- animal.
-
- HIND LIMBS: The back or rear legs of an
- animal.
-
- HORSETAILS: Living arthrophytes. The
- sole survivors of a once common group
- of plants are members of the one living
- genus, Equisetum, and are commonly
- called horsetails or scouring rushes.
- Horsetails and scouring rushes are
- sphenopsids, a group of jointed-stem
- plants that were most abundant during
- the Carboniferous Period. In ancient
- coal swamps, members of this group
- such as Calamites, a relative of
- Equisetum, grew to heights of over 50
- feet. Although the rest of the
- sphenopsids were extinct by the early
- Mesozoic Era, Equisetum has existed
- almost unchanged since the
- Carboniferous Period. It is still widely
- distributed, living in moist habitats,
- much as its ancestors did. Equisetum is
- a spore-bearing plant with true roots,
- stems, and leaves. The stems are
- hollow and are jointed. Whorls of leaves
- occur at each joint. These leaves
- usually are long and narrow, and
- sometimes are very reduced. Most
- plants are small, less than 3 feet high.
- Some species of Equisetum are
- sometimes called scouring rush because
- they contain small grains of abrasive
- silica, and early settlers in North
- America used the plant to scrub their
- pots and pans. A "living fossil."
-
- HOT-BLOODED: An outdated term for an
- animal that uses its metabolism to
- maintain a relatively high and constant
- body temperature, usually higher than
- that of the environment.
-
- HUAYANGOSAURUS: [hoy-Yang-oh-
- SOAR-uss] "Reptile from Huayang."
- Middle Jurassic, plated dinosaur. A
- primitive stegosaur with dorsal plates,
- many spines, and pre-maxillary teeth.
- Quadrupedal herbivore which grew up to
- 15 feet in length.
-
- HUMERUS: The upper arm bone. Not to
- be confused with humorous (funny).