Assertion: echinoderm's arm | /r/HasAspect | ambulacral groove
Facets:
value: on the undersurface
type: LOCATION
Source sentences:
text: Each arm has an ambulacral groove on the undersurface; in the furrow of the groove is the ambulacral area, or ambulacrum, with holes for the tube feet.
text: Arms contain extensions of coelomic, nervous, water vascular, and reproductive systems and bear an ambulacral groove bordered by fingerlike tube feet, or podia (terminal extensions of the water vascular system), used in suspension feeding and respiration (see figure above).
text: Each arm has an ambulacral groove on the undersurface; in the furrow of the groove is the ambulacral area, or ambulacrum, with holes for the tube feet.
text: Each arm has an ambulacral groove on the undersurface; in the furrow of the groove is the ambulacral area, or ambulacrum, with holes for the tube feet.