Echinoderms

Spiny skin Spiny skin Radial symmetry Radial symmetry Water vascular system Water vascular system

Water IS their blood! Water vascular system- respiration, circulation, movement. Water vascular system- respiration, circulation, movement. Madreporite- connects the ring canal to the outside. Madreporite- connects the ring canal to the outside.

Reproduction Sexual Sexual No visible difference between M and F! No visible difference between M and F! Asexual Many (NOT ALL) species can regenerate missing body parts Tear 1 sea star in half and with some luck both parts of the animal can regenerate the missing pieces.

Tube feet- movement, feeding, excretion. Tube feet- movement, feeding, excretion. Feeding- sea stars push out stomach and enzymes break down the animal. Feeding- sea stars push out stomach and enzymes break down the animal. Think “milkshake” Think “milkshake” Excretion- cellular through tube feet(ammonia), solid through anus. Excretion- cellular through tube feet(ammonia), solid through anus.

Groups of Echinoderms

Sea Urchins and Sand Dollars Large solid plates Large solid plates Most eat algae Most eat algae

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

Sea Cucumbers “ Moving pickles” “ Moving pickles” Detritus feeders Detritus feeders

Sea cucumber

Sea Stars Most are carnivores Most are carnivores Eat bivalves Eat bivalves Can repair themselves Can repair themselves

Tube feet in living sea star Tube feet in living sea star Tube feet in living sea star Tube feet in living sea star sea star hunting scallops and clams sea star hunting scallops and clams sea star hunting scallops and clams sea star hunting scallops and clams

Sea Lilies and Feather Stars Filter feeders Filter feeders Live in the tropics Live in the tropics

Feather Star