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Phylum ECHINODERMATA

Phylum ECHINODERMATA. The Echinoderms – Sea Stars, Sea Urchins and other “Spiny Skinned” Animals of the Ocean Floor. Body Characteristics. Body Symmetry: Radial Cell Organization: Cells to tissues to organs to organ systems Reproduction: Sexual

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Phylum ECHINODERMATA

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  1. Phylum ECHINODERMATA The Echinoderms – Sea Stars, Sea Urchins and other “Spiny Skinned” Animals of the Ocean Floor

  2. Body Characteristics • Body Symmetry: Radial • Cell Organization: Cells to tissues to organs to organ systems • Reproduction: Sexual • Body Development: zygotes grow into larva which undergoes COMPLETE METAMORPHOSIS to form the adult.

  3. Just the Facts… • No backbone • Name literally means “spiny-skinned” • There skeleton pokes through their skin! • Four major classes • Sea stars • Brittle stars • Sea urchins • Sea cucumbers • Spikes arranged in multiples of five

  4. Just the facts… • Live on the ocean floor • Endoskeleton – spiny internal skeleton made of plates that contain calcium • No anterior end to hold sense organs • Adapted to sense food and mates from any direction

  5. How Do Echinoderms Move? • Water Vascular System • Consists of fluid-filled tubes • The tubes contract squeezing water into structures called tube feet

  6. How Do Echinoderms Move? • The tube feet are sticky and when filled with water they act like tiny suction cups • The stickiness allows the echinoderm to grip surfaces and move along the ocean floor.

  7. What Do Echinoderms Eat? • Mollusks, crabs, and other echinoderms • A sea star will grasp the food with five arms, suctions the shell open, forces its stomach out through its mouth and in between the shell. • Digestive chemicals break down the prey and the sea star suctions the food into its body. • *Sea Cucumbers are filter feeders*

  8. How do Echinoderms Reproduce • Are either male or female • Eggs are fertilized in the water and develop into larva, the larva metamorphosize into adults • Can re-grow lost body parts through REGENERATION

  9. Echinoderm Examples

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