Animals skinned spines (echinoderms)

The characteristics of the animals whose skins thorns is:- Life at sea- Skin-barbed spines and have limestone slabs that serve as the framework- Radial symmetry shape- Does not have a clear head- Having dental pliers- Moves using legs ambulakral a small tubular- On foot ambulakral ujun contained a vacuum that allows you to attach themselves somewhere.
While the animals belonging to the thorn-skinned animals are:1. Starfish (Asteroidea)The characteristics of the starfish is:- Has five arms and the hands in the form of discs- Breathing using thin skin- Food countrymen soft clams and other animals- Have a stomach branching in all directions, especially in the arm- Having anal in the middle of the back- Arrangement of nerves in the form of nerve ring around the mouth- Has a huge regeneration and if one arm was broken, it can begin to grow again as before- Have legs that are used to move ambulakral.Example: red starfish and blue starfish.
2. Sea lilies (Crinoidea)Its features are:- Rich plant shape- No one has a stalk and others do not have stalks- Which is not stemmed his movable and which stemmed his life settle on a place.
3. Sea urchin (echinoidea)Its features are:- Does not have the arm- Has many thorns that easily moved- Breathe using gills.
4. Tripang (Holothuroidea)Its features are:- Shape like a cucumber- Does not have the arm- Has a mouth- Having sex and anal hole- Soft skin.
5. Stars snake (ophiuroidea)The characteristics of snake star is:- Has five arms that are used to move- Has a mouth hole- Life on the sidelines of the rock or rock in the sea- Have legs that are ambulakral around his mouth.