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Invertebrates

Lesson 3 ch4

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
share the basic definition of an invertebrate something without a backbone
List 8 main groups of invertebrates Arachnid, insect, crustacean, sea star, sea urchin, sea cucumber, brittle stars, and echinoderms
describe the characteristics of each group and include an animal example, use one notecard per invertebrate group
sponges asymmetrical invertebrates, no tissues or organs
cnidarians invertebrates, stinging cells, radial symmetry, lack organs, but they do have some tissue
flatworms long flat body that is soft, regeneration, scavengers, two way digestive system. All worms are the simplest animal with a brain, bilateral symmetry, with head and tail ends. Also have tissues, organs, and organ systems.
roundworms look like smooth, thin tubes. They have two body openings.
segmented worms made up of linked sections called segments.
mollusks invertebrates with soft unsegmented bodies that are often protected by a hard shell. They have a thin layer of tissue called a mantle that covers their internal organs and an organ called a foot. Foot may be used for crawling, digging, or catching prey.
arthropods invertebrates that have hard, outer coverings (called an exoskeleton or outer skeleton), segmented bodies, and pairs of jointed appendages.
echinoderms invertebrate that has an internal skeleton and a system of fluid filled tubes. They have radial symmetry. They use their tubes to move and obtain food and oxygen.
Created by: user-1915737
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