Assertion: horseshoe crab's pair | /r/SimilarTo | limb
Facets:
value: structurally
type: MANNER
value: behind the head
type: LOCATION
Source sentences:
text: The three pairs of post-antennal head legs in trilobites are structurally very much like the limbs behind the head, one pair of which was attached at each segment of the thorax and the pygidium.