http://en.wikipedia.org/wiki/Acetabulum_(morphology)
Mollusc
An octopus displaying its suckers with central cavity of acetabulum
Acetabulum in molluscs is a circular hollow opening on the arms. It occupies the central portion of the sucker and surrounded by a larger spherical cavity infundibulum.
Mollusc
An octopus displaying its suckers with central cavity of acetabulum
Acetabulum in molluscs is a circular hollow opening on the arms. It occupies the central portion of the sucker and surrounded by a larger spherical cavity infundibulum.
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