Echinoderms

Spiny skin Radial symmetry Water vascular system

Form and Function Water vascular- respiration, circulation, movement. Madreporite- connects the ring canal to the outside.

Tube feet- movement. Feeding- sea stars push out stomach and enzymes break down shells. Excretion- cellular through tube feet(ammonia), solid through anus. External fert.

Groups of Echinoderms

Sea Urchins and Sand Dollars Large solid plates Most eat algae

Brittle Stars Found on coral reefs Can shed an arm to escape                                                                                             Found on coral reefs Can shed an arm to escape Filter feeders

Sea Cucumbers “ Moving pickles” Detritus feeders

Slide 13

Sea Stars Most are carnivores Eat bivalves Can repair themselves

Sea Lilies and Feather Stars Filter feeders Live in the tropics

Feather Star (Note the depth)