Assertion: brittle star's system | /r/CapableOf | control hydraulic feet
Facets:
value: with the surrounding water
type: OTHER
Source sentences:
text: However, besides the differences described above, most brittle star species have spines on their arms and the madreporite, which connects the ambulacral system that controls the hydraulic feet with the surrounding water, is not located on the top side, as it is in starfishes, but on the bottom.