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Starfish –Phylum Echinodermata

Starfish –Phylum Echinodermata. Aboral surface. Oral surface. Starfish Dissection. Mouth. shell. Madreporite is opening of the water vascular system. Tube feet are the terminal end of the water vascular system. Starfish Dissection. ampulla. shell.

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Starfish –Phylum Echinodermata

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  1. Starfish –Phylum Echinodermata

  2. Aboral surface Oral surface Starfish Dissection Mouth shell Madreporite is opening of the water vascular system Tube feet are the terminal end of the water vascular system

  3. Starfish Dissection ampulla shell Starfish can evert their stomach through their mouths and begin digestion of the prey outside the body Gonads may be big or small depending on season

  4. Water Vascular System Water comes in the madreporite, travels through the stone canal to the ring canal and then flows through the radial canals in each arm. The short transverse canal connects the radial canal with the ampulla. When the ampulla fill with water, they contract and move the tube feet. Starfish Dissection Ring canal Radial canals in each ambulacral ridge Radial canals in each ambulacral ridge ampulla

  5. Echinoidea – sea urchins and sand dollars Crinoidia – sea lilies Asteriodia – sea stars = starfish Phylum Echinodermata (means spiny skin) Opiuroidea – brittle stars Holothuroidea – sea cucumbers

  6. Habitat: marine Symmetry: Bilateral larva, radial symmetry in adults Body Cavity: coelomate Development: Deuterostome Skeleton: spicules embedded in dermis or a calcareous endoskeleton composed of spines/ossicles Phylum Echinodermata

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