http://en.wikipedia.org/wiki/Acetabulum_(morphology)
Both these structures are thick muscles, and the acetabulum is speficially composed of radial muscles. They are covered with chitinous cuticle to make a protective surface.
Both these structures are thick muscles, and the acetabulum is speficially composed of radial muscles. They are covered with chitinous cuticle to make a protective surface.
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