2. Echinoderms
• Echinodermata means “spiny skin”.
• Radial symmetry.
• There are more than 5000 species of
Echinoderms.
• They lay eggs that undergo
metamorphosis
4. Sea Star Anatomy
Ambulacra tubes and ambulacra feet
http://www.youtube.com/watch?v=HPhAGyDceLo
To move, breathe, circulate water and
eliminate waste
5. Sea Stars- Starfish
• Most starfish have 5 “arms”or rays.
• They have tube feet for locomotion, and
strong suction to hold them in place.
• They breathe through small gills in their
skin.
• Their mouths are located on the
underside of their bodies.
• Starfish can regenerate. (must have the
central disc attached).
• Sea Stars are carnivorous. They eat
mostly shellfish, snails, and barnacles.
6. Sea Urchins
• Sea Urchins look like big pin cushions.
• They use these spines for protection
against predators.
• They eat mostly algae.