CHAPTER 10 SECTION 5 ECHINODERMS. CHARACTERISTICS OF ECHINODERMS Phyla: Echinodermata...
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Transcript of CHAPTER 10 SECTION 5 ECHINODERMS. CHARACTERISTICS OF ECHINODERMS Phyla: Echinodermata...
CHAPTER 10 SECT ION 5
ECHINODERMS
CHARACTERISTICS OF ECHINODERMS
• Phyla: Echinodermata• Characteristics• Invertebrates• Internal skeleton• Water vascular system• System of fluid-filled tubes
• Live in salt water• Radially symmetrical
BODY STRUCTURE
•Have endoskeleton• internal skeleton, made of hardened plates
•Body parts in multiples of 5 •Arranged like spokes on a wheel
MOVEMENT
•Water vascular system• Internal system of fluid-filled
tubes in echinoderms• Portions of the tubes in the
system contract, or squeeze together
• Tube Feet• Extensions of the water vascular
system• The function is for movement and
obtaining food• Sticky, act like sticky suction cups
PARTS OF A SEA STAR
REPRODUCTION AND LIFE CYCLE
• Either male or family• Eggs fertilized in water,
sperm is released• Fertilized eggs develop
into tiny, swimming larvae• Go through
metamorphosis
DIVERSITY OF ECHINODERMS
•Four major groups•Sea Stars•Brittle Stars•Sea Urchins•Sea Cucumbers
SEA STARS
• Eat mollusks, crabs, and even other echinoderms• Move using their tube feet• Also use tube feet to obtain food• Sea stars force their stomach out through its
mouth
• https://www.youtube.com/watch?v=l6dnmLDu6Eg
BRITTLE STAR
• Arms are long and slender, flexible joints• Slither along the ocean floor, snakelike motion•Use tube feet for catching food, no suction cups
SEA URCHINS
• No arms• Movable spines cover
and protect their bodies• Tube feet that extend
out from spines, aid in movement• Scrape and cut food
with five teethlike structures
SEA CUCUMBERS
• Look like cucumbers• Red, brown, green,
brown, blue…• Rows of tube feet on
underside enable them to crawl• Mouth surrounded by
tentacles, filter feeder, sweeps food toward mouth