Echinodermata Emily Ellinger, Cassandra Dengler, Kevin Hartsfeld, JP Detzner

Name of Phylum Echinodermata (spiny skin) Echinodermata (spiny skin)

Number of Germ Layers Triploelasic – three layers Triploelasic – three layers

Symmetry Adults – Radial Symmetry Adults – Radial Symmetry Larvae – Bilateral Symmetry Larvae – Bilateral Symmetry

Coelom Water vascular system Water vascular system Tube feet for motion Tube feet for motion Main body—fluid filled Main body—fluid filled Large and spacious Large and spacious

Digestive Tract Starfish extend their stomach out of their body around prey in order to digest them Starfish extend their stomach out of their body around prey in order to digest them Starfish have one hole for taking in food and expelling waste Starfish have one hole for taking in food and expelling waste Sea cucumbers crawl over sand and take it in. Their digestive tract filters edible parts out and everything else exits through the anus Sea cucumbers crawl over sand and take it in. Their digestive tract filters edible parts out and everything else exits through the anus

Cephalization None (no head) None (no head) Have a diffuse network of nerves spread out on the body Have a diffuse network of nerves spread out on the body Small ring of concentrated nerves around the mouth Small ring of concentrated nerves around the mouth

Segmentation No body segmentation No body segmentation Segmented limbs Segmented limbs

Skeleton and Appendages Endoskeleton Endoskeleton Spine originates from endoskeleton Spine originates from endoskeleton Body made of ossicles—small bone plates Body made of ossicles—small bone plates

Circulatory System Simple system Simple system Water pumped through body Water pumped through body Ambulacral hydrovascular, used for motion and food capturing Ambulacral hydrovascular, used for motion and food capturing

Respiratory system Poorly developed system of small gills on it’s spikes are responsible for taking in oxygen Poorly developed system of small gills on it’s spikes are responsible for taking in oxygen Same as circulatory (duel functioning) ambularal hydrovascular system Same as circulatory (duel functioning) ambularal hydrovascular system

Reproduction Sperm and eggs discharged into water Sperm and eggs discharged into water If a piece is chopped off, a new body can grow from it If a piece is chopped off, a new body can grow from it

Ocean floor Ocean floor Goo Lagoon Goo Lagoon Habitat

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