1 / 9

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”.

paki-parker
Télécharger la présentation

Echinoderms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related