( they ( ( ( ( ( ( 're actually ) arachnids ) , ) ( with ( ( eight legs ) ( as adults ) ) ) ) -RRB- ) . ) )
(ROOT (S (NP (PRP they)) (VP (VBP 're) (ADVP (RB actually)) (ADJP (JJ arachnids)) (, ,) (PP (IN with) (NP (NP (CD eight) (NNS legs)) (PP (IN as) (NP (NNS adults)))))) (-RRB- -RRB-) (. .)))
they're actually arachnids, with eight legs as adults).
(ROOT (S (SBAR (IN While) (FRAG (ADJP (JJ similar) (PP (TO to) (NP (NNS insects)))))) (, ,) (NP (NNS arachnids)) (VP (VBP are) (NP (NP (JJ eight-legged) (NNS invertebrates)) (SBAR (WHNP (WDT that)) (S (VP (VBP lack) (NP (NN antennae) (CC or) (NNS wings))))))) (. .)))