Deuterostomes: sea stars, sea urchins, sand dollars, sea cucumbers
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5 Terms
• Echinoderms and Chordates
• Represent < 5% of all animals
• Everything else are Protostomes
• Possess an endoskeleton derived from mesoderm
Phylum Echinodermata Characteristics
• Pentamerous radial symmetry (larval stage is bilateral)
• Complete digestion
• Endoskeleton made of ossicles (CaCO3)
• Separate sexes, external fertilization
• Carnivores or herbivores
Phylum Echinodermata –
Sea Star External Anatomy
Phylum Echinodermata –
Sea Star Internal Anatomy
Phylum Echinodermata – Sea Star
Water Vascular System: Used for locomotion, circulation, food/waste transport
Madreporite
Stone Canal
Ring Canal
Radial Canals
Lateral Canals
Ampulla/Tube
feet
Used for locomotion, circulation, food/waste transport
Note 
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