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16 Cards in this Set
- Front
- Back
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Subphylum Vertebrata
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Vertebrates
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Cephalization
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Concentration of neural & sensory equipment in head.
Bilateral symmetry. |
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Vertebral column
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Surrounds & protects nerve cord.
Provides structural support: Large body size, fast movement. |
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Closed circulatory system
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Ventral, chambered heart pumps blood through series of vessels.
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Jawless verterates
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Lack jaws & don’t have appendages: lampreys & hagfish
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Lampreys
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Attach to live prey & ingest blood
Introduced to Great Lakes via Erie Canal & nearly wiped out lake trout population. |
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Hagfish
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Scavengers, surround food item in a mucous bag.
Many eelskin products are made from hagfish skin. |
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Terrestrial animals
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Ancestor of tetrapods may have been lobe-finned fish.
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Class Amphibia
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Frogs, salamanders, caecilians.
Require water to moisten skin & for reproduction: eggs susceptible to desiccation. |
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Amphibia Traits
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Ectothermic.
External fertilization. 3-chambered heart & pulmocutaneous respiration. |
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Class Reptilia Traits
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Scales, amniotic egg, internal fertilization, ectothermic, 3-chambered heart.
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Dinosaurs & pterosaurs
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Most wiped out by end of Cretaceous period.
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Reptiles & water
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Appearance of shelled egg, developed lungs, resistance to desiccation allows tetrapods to move away from water.
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Chelonia
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Turtles.
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Squamata
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Lizards & snakes.
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Crocodilia
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Alligators & crocodiles.
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