Molpadiida

Molpadida is an order of sea cucumbers. The body shape is fusiform and unlike other sea cucumbers, their hind body is narrowed to form a distinct tail. Although they possess tentacles around the mouth derived from the water vascular system, they have no true tube feet, and are therefore believed to be related to the Apodida.

Caudinidae is a family of sea cucumbers, marine animals with elongated bodies, leathery skins and tentacles that are found on the sea floor.

Molpadiidae is a family of sea cucumbers, marine invertebrates with elongated bodies, leathery skins and tentacles that are found on or burrowing in the sea floor.

Acaudina is a genus of sea cucumbers of the family Caudinidae. They are small, smooth and spindle-shaped, with a thin body wall and are distinguished by their absence of a caudal appendage.

species of echinoderm

species of echinoderm

Eupyrgus is a genus of sea cucumbers. It is the only genus in the monotypic family Eupyrgidae.