The sea cucumbers constitute the class Holothuroidea.
They have become sausage-shaped and lie on their sides. They retain a reminder of their ancestral radial symmetry in having five rows of tubefeet with which they attach themselves to rocks. They have also become flexible because the spines in their skin are reduced to spicules. Spicules are easily revealed by macerating a fragment of the sea cucumber’s body wall in caustic soda (i.e., potassium hydroxide) and allow the correct identification of the sea cucumber’s species under microscopic examination. At the front of the body, sea cucumbers have a series of branching feeding tentacles that gather organic particles.
F*CK FISH 