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16 Cards in this Set

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Subphylum Vertebrata
Vertebrates
Cephalization
Concentration of neural & sensory equipment in head.
Bilateral symmetry.
Vertebral column
Surrounds & protects nerve cord.
Provides structural support:
Large body size, fast movement.
Closed circulatory system
Ventral, chambered heart pumps blood through series of vessels.
Jawless verterates
Lack jaws & don’t have appendages: lampreys & hagfish
Lampreys
Attach to live prey & ingest blood

Introduced to Great Lakes via Erie Canal & nearly wiped out lake trout population.
Hagfish
Scavengers, surround food item in a mucous bag.
Many eelskin products are made from hagfish skin.
Terrestrial animals
Ancestor of tetrapods may have been lobe-finned fish.
Class Amphibia
Frogs, salamanders, caecilians.
Require water to moisten skin & for reproduction: eggs susceptible to desiccation.
Amphibia Traits
Ectothermic.
External fertilization.
3-chambered heart & pulmocutaneous respiration.
Class Reptilia Traits
Scales, amniotic egg, internal fertilization, ectothermic, 3-chambered heart.
Dinosaurs & pterosaurs
Most wiped out by end of Cretaceous period.
Reptiles & water
Appearance of shelled egg, developed lungs, resistance to desiccation allows tetrapods to move away from water.
Chelonia
Turtles.
Squamata
Lizards & snakes.
Crocodilia
Alligators & crocodiles.