Because the hydrostatic skeletons have limited ability for attachment of limbs, the organisms are relatively simple and do not have many abilities to grab or latch onto things.
22.
University of Massachusetts researcher Diane Kelly documents a non-helical hydrostatic skeleton structure as the functional basis of the mammalian penis which must function similarly to a rigid element in use.
23.
They have limited control over movement, but can use their hydrostatic skeleton to navigate through contraction-pulsations of the bell-like body; some species actively swim most of the time, while others are mostly passive.
24.
When raised to the surface these animals burst, as they have a hydrostatic skeleton that normally experiences an average pressure of above . " Praya dubia " has been known since the nineteenth century, but its length was discovered only after the Monterey Bay Aquarium Research Institute undertook a systematic study of the water column in 1987.
