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Chapter 4
Lesson 3
| Term | Definition |
|---|---|
| Exoskeleton | External skeleton; a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrates |
| Endoskeleton | An internal skeleton; structural support system within the body of an animal |
| Share the basic definition of an invertebrate | An animal without a backbone |
| List the eight main groups of invertebrates | Sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, arthropods, echinoderms |
| Sponges | Asymmetrical invertebrates with some specialized cells but no tissues or organs and they stay in one place. (Example: Bath Sponge) |
| Cnidarians | Stinging cells radial symmetry no organs but they do have tissues (Example Jellyfish) |
| Flatworms | Bilateral symmetry with head and tail and flat, soft bodies and eyespots (Example: Planarian) |
| Roundworms | Bilateral symmetry with a head and tail. Smooth thin tubes. Have mouth and anus. (Hookworm and Tapeworm are examples) |
| Segmented worms | Segments, bilateral symmetry with head and tail (Example: Earthworm) |
| Mollusks | Invertebrates with soft, unsegmented bodies. Have a mantle. Three mayor groups: Gastropods Bivalves, and Cephalopods (Example: Snail) |
| Arthropods | Hard exoskeletons, segmented bodies and pairs of jointed appendages (Example: Spiders and Crabs) |
| Echinoderms | Fluid filled tubes and endoskeletons (Example: Sea Star) |
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