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Invertibrates

Chapter 4 Lesson 3

TermDefinition
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.
What is the definition of an invertebrate? An animal without a backbone.
What are the eight groups of invertebrates? Sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, athropods, and echinoderms.
What are the characteristics of a sponge? Are asymmetrical invertebrates. Have specialized cells but no tissues or organs. Stay in one place. Get energy from food.
What are the characteristics of a cnidarian? Have stinging cells. take food into central body cavity. Have radial symmetry. Lack organs, but have tissues.
What are the characteristics of a flatworm? Have symmetry. Have head and tail ends. Have tissues, organs, and organ systems. Have flat, soft bodies.
What are the characteristics of a roundworm? Have symmetry. Have head and tail ends. Have tissues, organs, and organ systems. Look like smooth tubes. Have a mouth and anus.
What are the characteristics of a segmented worm? Have symmetry. Have head and tail ends. Have tissues, organs, and organ systems. Made of many linked sections called segments. Simplest animals with brain to detect food and predators.
What are the characteristics of a mollusk? Has a thin layer of tissue called a mantle which covers internal organs. Has a "foot." Foot can be used for: crawling, digging, or catching prey.
What are the characteristics of a athropod? Have hard exoskeletons, segmented bodies, and pairs of jointed appendages.
What are the characteristics of a echinoderm? Has an endoskeleton and has a system of fluid tubes.
Created by: user-1915164
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