Presentation on theme: "Introduction to Echinoderms 5 th Grade. What are basic characteristics of an Echinoderm? Invertebrate ENDOskeleton (Internal skeleton) Water vascular."— Presentation transcript:
Introduction to Echinoderms 5 th Grade
What are basic characteristics of an Echinoderm? Invertebrate ENDOskeleton (Internal skeleton) Water vascular system: a system of fluid filled tubes Radial symmetry Tube Feet
Belong to the phylum “Echinodermata,” meaning “hedgehog skin”
Where do they live? ALL live in salt water
ENDOskeleton An INTERNAL skeleton made of hardened plates with skin stretched over it
Stick out from the echinoderm’s sides or underside Act like small, sticky suction cups Suction is used for gripping the surface beneath the echinoderm Use their tube feed to move slowly and capture food
How many species? More than 5000
Name 4 types of Echinoderms. Bonus: Think of a 5 th ! Sea stars Brittle stars Sea urchins Sea cucumber Sand dollars!
Common Questions: Where is a sea star’s mouth? How does it breathe? Mouth is located on the underside of its body in the center Breathe through small gills in their skin
Fun fact : If the central disc is still attached, sea stars can regenerate!
Sea Star Anatomy
Unlike a sea star’s arms, a brittle star’s arms are long and slim, with flexible joints Tube feet have no suction cups. They are used for catching food but not moving Move in a snake-like motion
How Brittle Stars move https://www.youtube.com/watch?v=KaJ0wqlo 3i4 https://www.youtube.com/watch?v=KaJ0wqlo 3i4
Sea Urchin No arms Moveable spine protects body (think of a pin cushion!) Use bands of tube feet that extend out between the spines Have teeth-like structures used to scrape & cut food
Look for the Sea Urchin teeth! https://www.youtube.com/watch?v=Agmlmb _9s2Y https://www.youtube.com/watch?v=Agmlmb _9s2Y
Can be red, brown, blue, or green Leather-like skin Soft, flexible, muscular bodies Tube feet that allow them to crawl slowly along the ocean floor Mouth is surrounded by tentacles –filter feeders! Sea cucumber eating:https://www.youtube.com/watch?v=420 IdYKfi7Ahttps://www.youtube.com/watch?v=420 IdYKfi7A
Sea Cucumber Anatomy
Sea Cucumber Fun Facts Can throw our their intestines as a defense mechanism and then regenerate them Some can be poisonous! They stick tentacles into their mouths and lick them off, the way you might lick your fingers!
Sand Dollars Found in the Intertidal Zone of the ocean https://www.youtube.com/watch?v=ykoYhCm iaH0 https://www.youtube.com/watch?v=ykoYhCm iaH0