Assertion: brittle star's arm | /r/HasProperty | designated as the centre limb
Facets:
Source sentences:
text: One arm is designated as the centre limb, two as the forelimbs and two as hindlimbs.
text: When the five trimmed arms remained, one arm is designated as the centre limb that orients the direction of movement, two as the forelimbs that move synchronously to propel the body, and two as hindlimbs that take a minimal role in propulsion, in a similar manner as intact brittle stars (figure 1d(A)).