sea cucumbers are echinoderms they have an internal skeleton, but evolution has
led this to be reduced to small calcareous plates embedded in
the skin. The sea cucumber has a simple physiology, a tubular body
with a mouth and anus at either end.
mouth is surrounded by tentacles used for the intake of food. Sea
have tube feet and move by crawling. Sea cucumbers are slow moving
and have evolved anti predator strategies. Some species expel cuvarian
tubules which are sticky white threads while others expel their
internal organs. The internal organs will regenerate.