Small organic particles are moved into the mouth by the tube feet.

The tube feet are pointed and do not have suckers.

By day seven they have two pairs of tube feet and begin to move around.

Inside the mouth edge there is a second pair of tube feet.

The animal handles the world outside by using its tube feet.

Exchange of gases also takes place through the tube feet.

The arms start to form and tube feet begin to appear.

The vessels of the water vascular system end in tube feet.

Almost all species in this order have five arms with tube feet.

Highly modified tube feet around the mouth are always present.