EchinodermsEchinoderms

Spiny skinSpiny skin Radial symmetryRadial symmetry Water vascular Water vascular

systemsystem

Form and FunctionForm and Function

Water vascular- Water vascular- respiration, respiration, circulation, circulation, movement.movement.

Madreporite- Madreporite- connects the ring connects the ring canal to the canal to the outside.outside.

Tube feet- movement.Tube feet- movement. Feeding- sea stars push out Feeding- sea stars push out

stomach and enzymes break down stomach and enzymes break down shells.shells.

Excretion- cellular through tube Excretion- cellular through tube feet(ammonia), solid through anus.feet(ammonia), solid through anus.

External fert.External fert.

Groups of Groups of EchinodermsEchinoderms

Sea Urchins and Sand Sea Urchins and Sand DollarsDollars

Large solid platesLarge solid plates Most eat algaeMost eat algae

Brittle StarsBrittle Stars

Found on coral Found on coral reefsreefs

Can shed an arm Can shed an arm to escapeto escape

Filter feeders Filter feeders                                          

                                                 

Sea CucumbersSea Cucumbers

“ “ Moving pickles”Moving pickles” Detritus feedersDetritus feeders

Slide 13

Sea StarsSea Stars

Most are Most are carnivorescarnivores

Eat bivalvesEat bivalves Can repair Can repair

themselvesthemselves

Sea Lilies and Feather Sea Lilies and Feather StarsStars

Filter feedersFilter feeders Live in the tropicsLive in the tropics

Feather Star (Note the Feather Star (Note the depth)depth)