(phylum echinodermata) ... (phylum echinodermata) april 08, 2013 examples of echinoderms sea...

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  • April 08, 2013

    Echinoderms (Phylum Echinodermata)

  • April 08, 2013

    Examples of Echinoderms

    Sea cucumbers Sea stars

    Sea urchins Sand dollars

  • April 08, 2013

    Echinoderms are...

    Invertebrates with an internal skeleton, have radial symmetry, and a system of fluid-filled tubes

    called a water vascular system

    ALL echinoderms live in SALT water

  • April 08, 2013

    Body Structure

    Endoskeleton is an internal skeleton that is made of hardened plates

    Bumpy texture

    Radial symmetry - the body parts (usually in multiples of 5) are arranged like wheel spokes

  • April 08, 2013

    Movement

    Water vascular system - internal system of fluid-filled tubes

    Some of the tubes in this system can squeeze together and force water into the tube feet

    The tube feet stick out from the side or underside of an echinoderm - the ends of the tube feet are sticky.

    When the tube feet fill with water they act like suction cups the grip helps them move SLOWLY and capture food.

  • April 08, 2013

    Reproduction & Life Cycle

    - Almost all are either male or female - Eggs usually fertilized in the water - Female releases eggs / male releases sperm - Fertilized eggs develop into tiny larvae - Larvae look very different from adults - Undergo metamorphosis to become adults

  • April 08, 2013

    Four major groups of Echinoderms

    Sea Stars Brittle Stars Sea Urchins

    Sea Cucumbers

  • April 08, 2013

    Sea Stars

    - Predators that eat mollusks, crabs and other echinoderms - Use tube feet to move & capture prey - Can grasp prey with five arms - Release digestive chemicals to break down prey - Sucks partially digested food in through mouth

    http://www.youtube.com/watch?v=A100m5EpfFI

  • April 08, 2013

    Brittle Stars

    - Arms are long and slender with flexible joints - tube feet have no suction cups - tube feet are used for catching food only - slither along the ocean bottom by waving their arms in a snakelike motion

    http://www.youtube.com/watch?v=WOkppGxqcrM

  • April 08, 2013

    Sea Urchins - Have no arms - Body is covered and protected by moveable spines - Look like a pincushion - Spines cover a central shell that is made of plates joined together - Use tube feet to move - Scrape and cut food (like seaweed) with 5 teeth-like structures that come out of their mouths

    http://www.youtube.com/watch?v=D3W4OCnHyCs

  • April 08, 2013

    Sea Cucumbers

    - can be red, brown, blue or green - leather-like skin - bodies are soft, flexible, and muscular - have rows of tube feet on underside - crawl slowly along the ocean floor - have a mouth surrounded by tentacles, can lengthen tentacles to sweep food towards mouth - filter feeders

  • April 08, 2013

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