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Echinoderms

Echinoderms. Characteristics of Echinoderms. Echinoderms are invertebrates They have radial symmetry They have an internal skeleton called an endoskeleton They have a system of fluid-filled tubes called a water vascular system THINK! – What does echinoderm mean? “Spiny Skinned”.

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Echinoderms

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  1. Echinoderms

  2. Characteristics of Echinoderms • Echinoderms are invertebrates • They have radial symmetry • They have an internal skeleton called an endoskeleton • They have a system of fluid-filled tubes called a water vascular system • THINK! – What does echinoderm mean? • “Spiny Skinned”

  3. Movement • An echinoderm has an internal system of tiny fluid-filled tubes. • Portions of these tubes can squeeze together forcing water into structures called tube feet. • The tube feet stick out from the echinoderm’s underside and when filled with water act like suction cups. • This allows the echinoderm to grip the surface of an object and move along slowly. • Video Clip - Echinoderms in a Minute! Check out how they move!

  4. Activity: Color Coding a Sea Star Stomach anus • Use the following key • Anus • Stomach • Digestive Glands • Ring Canal • Water Vascular System • Tube Feet • Spines Spines Tube feet Water Vascular System Digestive glands Ring Canal

  5. Sea Stars • Predators that eat mollusks, crabs, and other echinoderms • A sea star will grasp a clam with all 5 arms and force its stomach out. Digestive juices then break down the clam’s tissue so the sea star can eat.

  6. Brittle Stars • It has long, slender arms with flexible joints. • Brittle stars do not have suction cups. • They move by waving each of their long arms in a snake-like motion against the ocean floor.

  7. Sea Urchins • They have no arms • Movable spines cover their body • To move, bands of tube feet extend out between the spines • They eat their food (seaweed) with 5 teethlike structures protruding from their mouth

  8. Sea Cucumbers • They look like cucumbers • Underneath their leather-like skin their bodies are soft, flexible, and muscular • They use their tube feet to crawl • It uses tentacles around its mouth to feed

  9. Echinoderms Video Clip • Watch this clip closely to see how the tube feet work in movement!

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