1. Echinoderms
Chapter 10 Section 5

2. Characteristics of Echinoderms
Phyla: Echinodermata
Characteristics
Invertebrates
Internal skeleton
Water vascular system
System of fluid-filled tubes
Live in salt water
Radially symmetrical

3. Body Structure Have endoskeleton
internal skeleton, made of hardened plates
Body parts in multiples of 5
Arranged like spokes on a wheel

4. Movement Water vascular system Tube Feet
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

5. Parts of a Sea Star

6. 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

7. Diversity of Echinoderms
Four major groups
Sea Stars
Brittle Stars
Sea Urchins
Sea Cucumbers

8. 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

9. 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

10. 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

11. 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