Transcript Chapter 10 Section 5 Power Point

ECHINODERMS
CHAPTER 10 SECTION 5
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 female
• 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, blue…
• Rows of tube feet on
underside enable them to
crawl
• Mouth surrounded by
tentacles, filter feeder,
sweeps food toward
mouth