Download Evolution of the Body Cavity

Echinodermata
Basket starfish
Red Sea Urchin
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Animals with a coelom (body
cavity).
Body cavity is a space for
specialized organs systems
within the body.
Echinoderms are coelomate
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Endoskeleton, Water based vascular system
("tube feet"), Complete digestive systems,
Decentralized nervous system,
Only Phylum that is entirely marine based
Come in different shapes sizes but all have
some sort of spines on skin
Sunstar
Sea Cucumber
Sand Dollar
Purple Sea Urchins
Most starfish are predators, feeding on sessile or slowmoving prey such as mollusks and barnacles. Many, but
not all, starfish are turn a portion of their stomachs out
through the mouth, digest food outside of the body.
Endoskeleton made of CaCO3
(Calcium Carbonate)
Water Vascular Tube System – allows
for movement
Regenerative abilities
Separate sexes (Male and Female) that
reproduce externally.
Spiny skin for support and protection