echinoderms echinoderms are spiny- skinned invertebrates that live in the water

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  • Echinoderms are spiny-skinned invertebrates that live in the water.

  • Examples of Echinoderms

    Sea-star/Star FishSea urchinSand dollarSea cucumber

  • Echinoderms move around using tube feet. They are hollow structures with suckers on the end. Water is pumped into the tube feet and the feet extend. Water is sucked back into the body and feet contract. As the tube feet extend and contract, the echinoderm moves ahead.


  • Lets talk about Sea-Stars a.k.a. Star Fish

  • STAR FISH they are also called sea stars. They have five arms and look somewhat like a pointed star. Others have many arms and are called sun stars.



  • Wouldnt his camouflage work better on the rock?!?

  • Starfish can regenerate new arms when the old ones are broken off. Even if a starfish is cut in two, each of the pieces will regenerate into a new animal. Most live for about three to five years.

  • Close up of a starfishs spines.



  • This starfish is hanging onto the side with its tube feet.


  • What is a Sea Urchin?

  • SEA URCHIN the sea urchin is shaped like a ball and is covered in long, moveable spines. They are called scavengers because they feed on decaying matter.

  • SEA URCHIN with other invertebrates along for a ride!

  • Sea urchin spines and tube feet.

  • Have you seen a Sand Dollar before?

  • SAND DOLLAR The sand dollar lives slightly buried in the sand. It eats tiny bits of animals and plants found in the sand grains. The food travels along the grooves on the underside of the sand dollars body to its mouth.


  • The sand dollar has a thin, flat, circular body. It looks like a silver dollar or a cookie. The body of the sand dollar has many slots. The top surface has a set of breathing tubes that are arranged in the form of a five-point star. The sand dollars body is covered with tiny movable spines which are used for crawling and digging.

  • Dont forget aboutSea cucumbers!!!

  • Sea Cucumbers are unusual Echinoderms-their supporting spines are microscopic and under their skin. They are cylindrical in shape.

  • See the tube feet?!?

  • Sea cucumbers come in many sizes and colors.

  • One last sea cucumber!

  • A REALLY COOL FACTThe starfish can push its stomach out through its mouth!!! Many starfish feed on shelled animals such as mussels, clams, and oysters. When it feeds on an oyster, it attaches its tube feet to the two halves of the oysters shell and pulls the shell halves apart to make a tiny crack. Then the starfish pushes its stomach into the crack. The stomach surrounds the oysters soft body, slowly digests it, and absorbs the food into its body.Isnt that amazing?!!!

  • THE END!

    By: Julie Hunt and Marta Howard ~ Degan Elementary


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