EchinodermataEchinodermataEmily Ellinger, Emily Ellinger,

Cassandra Dengler,Cassandra Dengler,Kevin Hartsfeld,Kevin Hartsfeld,

JP DetznerJP Detzner

Name of PhylumName of Phylum

• Echinodermata (spiny skin)Echinodermata (spiny skin)

Number of Germ LayersNumber of Germ Layers

• Triploelasic – three layersTriploelasic – three layers

SymmetrySymmetry

• Adults – Radial SymmetryAdults – Radial Symmetry• Larvae – Bilateral SymmetryLarvae – Bilateral Symmetry

CoelomCoelom

• Water vascular systemWater vascular system• Tube feet for motionTube feet for motion• Main body—fluid filledMain body—fluid filled• Large and spaciousLarge and spacious

Digestive Tract• Starfish extend their stomach Starfish extend their stomach

out of their body around out of their body around prey in order to digest themprey in order to digest them

• Starfish have one hole for Starfish have one hole for taking in food and expelling taking in food and expelling wastewaste

• Sea cucumbers crawl over Sea cucumbers crawl over sand and take it in. Their sand and take it in. Their digestive tract filters edible digestive tract filters edible parts out and everything else parts out and everything else exits through the anusexits through the anus

CephalizationCephalization

• None (no head)None (no head)• Have a diffuse Have a diffuse

network of nerves network of nerves spread out on the spread out on the bodybody

• Small ring of Small ring of concentrated nerves concentrated nerves around the moutharound the mouth

SegmentationSegmentation

• No body segmentationNo body segmentation• Segmented limbsSegmented limbs

Skeleton and AppendagesSkeleton and Appendages• EndoskeletonEndoskeleton• Spine originates from endoskeletonSpine originates from endoskeleton• Body made of ossicles—small bone platesBody made of ossicles—small bone plates

Circulatory SystemCirculatory System

• Simple systemSimple system• Water pumped Water pumped

through bodythrough body• Ambulacral Ambulacral

hydrovascular, used hydrovascular, used for motion and food for motion and food capturingcapturing

Respiratory systemRespiratory system

• Poorly developed system of small gills on it’s spikes are Poorly developed system of small gills on it’s spikes are responsible for taking in oxygenresponsible for taking in oxygen

• Same as circulatory (duel functioning) ambularal hydrovascular Same as circulatory (duel functioning) ambularal hydrovascular system system

ReproductionReproduction

• Sperm and Sperm and eggs eggs discharged discharged into waterinto water

• If a piece is If a piece is chopped off, a chopped off, a new body can new body can grow from itgrow from it

• Ocean floorOcean floor• Goo LagoonGoo Lagoon

Habitat

Some Real StarfishSome Real Starfish

The Coolest Starfish

http://www.youtube.com/watch?v=7Knhaxy3waI