Echinoderms. Sea Star Sea Cucumber Brittle Star.

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Presentation transcript:

Echinoderms

Sea Star

Sea Cucumber

Brittle Star

Urchin

Sand Dollar (Keyhole Urchin)

Video Clip from Blue Planet watch?v=r4cX2EPt2zE Finger of Death

Phylum Echinodermata “Spiny skin” Radial symmetry – 5 parts or multiples of 5 Water vascular system – hydraulic pressure system for movement

Water Vascular System

WVS Operation Water enters through madreporite Through tube system to ampullae of feet Muscle contracts - water ejected onto foot – suction Muscle relaxes – water back into ampullae – no suction

Skeletons Plates under skin (some fused) or spicules (endoskeleton) Ca(CO 3 ) – like mollusks Projections

Sea Stars Flexible – plates of skeleton with muscles Ambulacral groove with tube feet Mouth and anus Eyespots sense light

Sea Star Feeding Diet – mollusks, coral Opens shells with tube feet Extrudes stomach Liquefies mollusk

Brittle Stars Distinct central disk Tube feet have no suction – send food to mouth Arms for locomotion Mouths with teeth No anus

Regeneration Need 1/5 of central disk and 1 arm to regenerate

Sea Urchins Test Mouth and anus Ball and socket spines Spines and tube feet for movement

Sea Urchins Algae-eaters and scavengers Mouth with teeth (Aristotle’s Lantern)

Sand Dollars Flat sea urchins Short spines

Sea Cucumber Elongated body Small skeletal fragments Modified tube feet for tentacles on oral end