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| A sheath of tissue surrounding the organs of a mollusk, producing the mollusk's shell and performing respiration |
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| An organ covered with hundreds of small teeth, used for scraping food into the mouths of mollusks |
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| A derivative of carbohydrates that provides both flexibility and support |
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| A circulatory system in which blood flows out of the blood vessels and into body cavities, where it comes in direct contact with cells |
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| Closed circulatory system |
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Definition
| A circulatory system in which the blood always remains in vessels |
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| The anterior part of an arthropod body, consisting of a head and other body segments fused together |
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| An armored shield that covers the anterior portion of crustaceans |
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| A channel along the oral surface of echinoderms through which the tube feet protrude |
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| A network of water-filled canals in echinoderms, used for locomotion and feeding |
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| A flexible supportive rod that runs the length of the body of the chordates |
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| A long bundle of nerve cells located along the dorsal part of an organism's body |
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| Radial symmetry based on five radiating parts |
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| Fluid that transports nutrients and gases throughout the bodies of echinoderms, instead of a circulatory system. |
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| The process of shedding an exoskeleton to grow, as in the case of arthropods. |
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| tiny extensions of the canals within the water vascular system of echinoderms which, when filled with water, extend for locomotion, as well as sensory, respiratory, and excretory duties. |
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| creatures which cover themselves with a "tunic" when they are adults |
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| ...can regrow into a new starfish. Or, if a sea star loses an arm, it can regrow it. It will not die. |
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| Horseshoe and hermit crabs... |
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| Threads used by mussels and other bivalves to cement themselves to rocks. |
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| Parts of bivalves that suck in and expel water |
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| ...keep the undischarged nematocysts of their prey and use them for protection |
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Definition
| A horny plate used for protection, not locomotion |
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Definition
| ...have no noticable head |
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