Bilateral symmetry :)
All echinoderms have radial symmetry
Radial Symmetry
Platyhelminthes exhibit bilateral symmetry, meaning they can be divided into two equal halves along a single plane. This symmetry type allows for better movement and coordination in these flatworms.
One type of symmetry is rotation. The second type of symmetry is translation. The third type of symmetry is reflection.
Some well known gastropods, which are mollusks, are snails and slugs, and they exhibit what is known as BILATERAL SYMMETRY. The only other kind of symmetry that exists in the animal kingdom, with the exception of colonial species such as the sponge, is RADIAL SYMMETRY. This second type is exhibited by starfish, for example. Cephalopods, another type of mollusk, may appear to be radially symmetric, but are actually bilaterally symmetric due to the composition of their cephalic (head) region.
Echinoderm
Bilateral Symmetry
Bilateral symmetry
Arial symmetry
Bilateral symmetry.
Bilateral Symmetry