( Arachnids ( ( have ( ( ( ( 4 pairs ) ( of ( walking legs ) ) ) , ) ( usually 7-segmented ) ) ) . ) )
(ROOT (S (NP (NNS Arachnids)) (VP (VBP have) (NP (NP (NP (CD 4) (NNS pairs)) (PP (IN of) (NP (VBG walking) (NNS legs)))) (, ,) (ADJP (RB usually) (JJ 7-segmented)))) (. .)))
Arachnids have 4 pairs of walking legs, usually 7-segmented.
(ROOT (S (NP (NNS Arachnids)) (VP (VBP have) (NP (NP (CD 4) (NNS pairs)) (PP (IN of) (NP (NNS legs))))) (. .)))