Starfish

Lateral Canal- tube feet are attached.
Stone Canal- where water enters.
canal- leads from the ring canal to the madreporite.
abulacral groove- extends down the underside of each arm.
spines- protects starfish and are part of internal skeleton.
madreporite- this is where water enters.
central disc- center of starfish.
dorsal or aboral- top of starfish.
mouth- underside

Name of organism: Starfish - Phylum
Habitat: usually in rock places in the ocean, bottom of sea, coral reefs, or even sands.
Food source: algal films, feed on something dead, or mussels.
Life cycle: Male or female, Fertilization is external and occurs when sea stars release enormous numbers of sperm and eggs in the ocean.
Moves by: The underside of the starfish is covered with hundreds of tube feet, which it uses for walking around, for attaching tightly to rocks, and for holding on to prey. To move, each tube foot swings like a leg, lifting up and swinging forward, then planting itself on the ground and pushing back. At the tip of each tube foot is a suction cup. These aren't used when walking on level ground, but can be used when walking up sheer surfaces (How starfish move-online).
Unique Characteristics: On the underside of each sea star is the mouth along with a distinct cleft through which food is moved to the mouth. Some sea stars do not have a separate opening for removing waste and as such, their "mouths" act as both the site for the import of food and the export of waste materials. Interestingly, these invertebrates are also capable of regenerating body parts from body fragments.
Role: The starfish role in the ecosystem is just plain and simple. They are harmless and come in beautiful colors. They just tend to make the ocean more colrful and beautiful. it is an eye catcher to marine life and humans as well.