hydrostatic skeleton

What is hydrostatic skeleton?

hydrostatic skeleton meaning a type of skeleton found in many soft-bodied invertebrates which consists of a turgid column of liquid within one of the body spaces that provides support or rigidity to the organism or to one of its parts. Hydrostatic skeletons are found in echinoderms (starfish, sea urchins), annelids (worms), nematodes (roundworms), and a number of other wormlike invertebrate phyla

 

reference: Coral Reef Information System – Glossary

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