Linked from
The 26 pages that link to Hydrostatic skeleton, each with the reason it gives.
ExoskeletonCompared with: It achieves support without a rigid external covering.
EarthwormRelated: Fluid-filled segments provide resistance against which earthworm muscles push.
NematodeRelated: Fluid pressure and longitudinal muscles let nematodes bend and move.
AnnelidRelated: Coelomic fluid provides the resistance that annelid body-wall muscles push against.
CoelomRelated: Coelomic fluid can provide the pressure used for support and locomotion.
InvertebrateRelated: Many soft-bodied invertebrates move by deforming fluid-filled bodies.
ParapodiumRelated: Parapodial strokes work against the fluid-supported body of many annelids.
ChaetaRelated: Chaetae gain traction while the annelid's fluid-supported body changes shape.
HemolymphRelated: Hemolymph pressure can contribute to support or movement in some animals.
SipunculaRelated: Sipunculans use internal fluid pressure and muscles to change body shape and move.