A sea cucumber (Actinopyga echinites), displaying its feeding tentacles and tube feet

Echinoderms come from the words echinos and derma. Echinos means thorn, derma means skin. Thus, echinoderms are animals that have spines on their skin. Live in marine habitats. The outside of the body is very hard, composed of lime / chitin. It has five arms radially and symmetrically. Has the ability autotomy, namely the ability to cut off a body part … Read more