Fell, Howard B. Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts.
Last reviewed:January 2020
- Relation to humans
- Muscular system
- Alimentary system
- Nervous system
- Life history
- Reproductive system
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A class of Echinozoa characterized by a cylindrical body and smooth leathery skin, which are known as sea cucumbers. In Holothuroidea, there are no arms, but a ring of five or more tentacles may surround the mouth, which is usually at one end of the body. There are no pedicellariae (small grasping organs). Tube feet may be present or lacking. There are no ambulacral grooves, although they are represented by internal epineural canals overlying the radial nerves. See also: Echinozoa
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