Echinoderms. Spiny skin Spiny skin Radial symmetry Radial symmetry Water vascular system Water vascular system.
Post on 13-Jan-2016
Spiny skinRadial symmetryWater vascular system
Water IS their blood!Water vascular system- respiration, circulation, movement.Madreporite- connects the ring canal to the outside.
ReproductionSexualNo visible difference between M and F!AsexualMany (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.Feeding- sea stars push out stomach and enzymes break down the animal.Think milkshakeExcretion- cellular through tube feet(ammonia), solid through anus.
Groups of Echinoderms
Sea Urchins and Sand DollarsLarge solid platesMost eat algae
Brittle StarsFound on coral reefsCan shed an arm to escapeFilter feeders
Sea Cucumbers Moving picklesDetritus feeders
Sea StarsMost are carnivoresEat bivalvesCan repair themselves
Tube feet in living sea starsea star hunting scallops and clams
Sea Lilies and Feather StarsFilter feedersLive in the tropics