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Echinoderms

Echinoderms. Secondary school

Echinoderms

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Phyllum Echinodermata
Sand Dollars
Sea urchins Sea stars
(starfish)
Sea cucumbers
Ophiura
Echinoderms
• Echinodermata means “spiny skin”.
• Radial symmetry.
• There are more than 5000 species of
Echinoderms.
• They lay eggs that undergo
metamorphosis
Echinoderms
Skeleton covered by
skin Dermoskeleton
Sea Star Anatomy
Ambulacra tubes and ambulacra feet
http://www.youtube.com/watch?v=HPhAGyDceLo
To move, breathe, circulate water and
eliminate waste
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.
Sea Urchins
• Sea Urchins look like big pin cushions.
• They use these spines for protection
against predators.
• They eat mostly algae.
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Echinoderms