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| tough, non-living external skeleton composed of chitin and secreted by the underlying layer of tissue. Provides protection, support, flexibility, and increased surface area` for muscle attachment. (pg. 134) |
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| muscular extensions of the water vascular system. Tube feet are extended when filled with water, sometimes by the action of muscular sacs called ampullae, that extend inside the body opposite the tube feet. (pg. 141) |
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| have a backbone, also called vertebral column or spine, which is a dorsal row of hollow skeletal elements, usually bone, called vertebrae. (pg. 151) |
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| a flexible rod for support that lies between the nerve cord and the gut. (pg. 145) |
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| runs along the dorsal length of the animal. (pg. 145) |
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| Jointed leg with exoskeleton, complete digestive track, organ system, bilateral symmetry, |
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| Copepods, Decapods, Krill, Barnacles |
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Spiny skinned with calcium carbonate endoskeleton and water vascular system, complete digestive track, organ system, bilateral/pentraradial (5 lines of radial symmetry)
Sea Stars
Brittle Stars
Sea Urchins
Sand Dollars |
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| Vertebrates with lungs, gill slits, complete digestive track, organ system, bilateral symmetry |
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