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- ACETABULUM: The cup-shaped socket in
- the pelvis which receives the head of the
- thigh bone, or femur. Hip socket.
-
- ALBERTOSAURUS: [al-BERT-oh-Soar-
- uss] "Reptile from Alberta." Late
- Cretaceous, bipedal, flesh-eating
- dinosaur found in North America.
- [Montana; New Mexico; Wyoming;
- Alberta, Canada]. Slightly smaller than
- Tyrannosaurus at up to 26 feet in length.
-
- ALKALOIDS: Any of a group of organic
- compounds that contain nitrogen,
- especially those derived from plants.
- They have a powerful physiological
- effect on animals, and include nicotine,
- morphine, codeine, quinine, and
- strychnine, among others.
-
- ALLOSAURUS: [Al-oh-SOAR-uss]
- "Strange Reptile." Late Jurassic,
- bipedal, flesh-eating dinosaur found in
- western North America. [Colorado;
- Montana; New Mexico; Oklahoma; South
- Dakota; Utah; and Wyoming] The
- largest flesh eater of the Jurassic,
- growing up to 39 feet long.
-
- AMPHIBIAN: A vertebrate animal that
- hatches from eggs in water, spends its
- legless juvenile existence there, then
- usually metamorphoses into air-
- breathing, land-dwelling, four-legged
- adults.
-
- AMPHIBIOUS: Animal able to live both
- on land and in water.
-
- ANATOTITAN: [ann-Att-oh-TIE-tann]
- "Titanic Duck." Late Cretaceous,
- bipedal, herbivorous dinosaur found in
- western North America. [Wyoming].
- Closely related to Edmontosaurus. Up to
- 33 feet long. Named by Smithsonian
- Museum Specialist Dr. M. K. Brett-
- Surman.
-
- ANCESTRAL: Of, pertaining to, or
- inherited from an earlier and usually
- simpler type.
-
- ANGIOSPERMS: True flowering plants
- with "seeds in a container." The
- gamete-bearing generation is hidden
- within the flower, where the immature
- seeds develop within a protective
- structure called an ovary. All other
- seed plants are gymnosperms.
-
- ANTRODEMUS: An old name for
- Allosaurus.
-
- ANKYLOSAURS: Quadrupedal, armored,
- ornithischian dinosaurs.
-
- ANKYLOSAURUS: [ann-Kye-low-SOAR-
- uss] "Fused Reptile." Late Cretaceous,
- quadrupedal, herbivorous, armored
- dinosaur found in western North
- America. [Montana; Wyoming; Alberta,
- Canada]. Closely related to
- Euoplocephalus.
-
- ANTORBITAL FENESTRA: A hole in the
- skull located between the nostril (naris)
- and the eye (orbit).
-
- APATOSAURUS: [ah-Pat-oh-SOAR-uss]
- "Deceptive Reptile." Late Jurassic,
- quadrupedal, herbivorous sauropod
- dinosaur found in western North
- America. [Colorado; Oklahoma; Utah;
- and Wyoming] Closely related to
- Diplodocus. Up to 69 feet long. Once
- known as "Brontosaurus."
-
- ARCHAEOPTERYX: [are-kee-OPP-tair-
- icks] "Ancient Wing." The earliest-
- known bird from the Late Jurassic Period
- of western Europe [Germany]. Closely
- related to dinosaurs. Roughly the size of
- a raven - up to 20 inches long.
-
- ARCHOSAURS: "Ruling Reptiles." A
- major group of reptiles which includes
- not only extinct creatures like
- pterosaurs; dinosaurs and their living
- relatives, the BIRDS; but also living
- examples with a long fossil record, such
- as crocodiles and their extinct relatives.
-
- ARMORED: Possessing bodies that are
- covered with bony plates, or that have
- projections of bony plates or spikes, or
- any combination among the three.
-
- ARTHROPHYTES: "Jointed Plants."
- Plants with jointed stems that reproduce
- by spores. Spore sacs of arthrophytes
- are attached to the ends of lateral
- branches arranged in whorls on the main
- stem. The earliest-known arthrophytes
- are from the Devonian Period. The sole
- modern survivor of this group is
- Equisetum. Sphenopsid is another name
- for arthrophyte.
-
- ARTHROPODS: Any of numerous
- invertebrate animals which have jointed
- legs, an exoskeleton, and segmented
- body parts. This Phylum includes living
- examples such as insects, crustaceans,
- arachnids, myriapods, and
- onychophorans, and extinct forms like
- trilobites.
-
- ARTICULATED: United by means of
- joints.
-
- ASTRAGALUS: (Azz-TRAGG-ah-luss) In
- vertebrates, the proximal bone of the
- foot. Anklebone.