Concept
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Types of Skeletal Systems
Hydrostatic skeleton
The skeleton of the red-knobbed sea star (Protoreaster linckii) is an example of a hydrostatic skeleton.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Types of Skeletal Systems. October 17, 2013."
http://cnx.org/content/m44781/latest/Figure_38_01_01.jpg
OpenStax CNX
CC BY 3.0.