( ( ( ( ( ( The Rhizocephala ) ( are ( parasites ( of ( decapod crustaceans ) ) ) ) ) , ) and ) ( they ( have ( ( been widely ) ( assumed ( to ( be ( ( derived ( barnacles ( -LRB- ( Cirripedia -RRB- ) ) ) ) ( because ( ( their ( larval stages ) ) ( are ( very ( similar ( to ( those ( of barnacles ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NNP Rhizocephala)) (VP (VBP are) (NP (NP (NNS parasites)) (PP (IN of) (NP (JJ decapod) (NNS crustaceans)))))) (, ,) (CC and) (S (NP (PRP they)) (VP (VBP have) (VP (VBN been) (ADVP (RB widely)) (VP (VBN assumed) (S (VP (TO to) (VP (VB be) (VP (VBN derived) (NP (NP (NNS barnacles)) (PRN (-LRB- -LRB-) (NP (NNP Cirripedia)) (-RRB- -RRB-))) (SBAR (IN because) (S (NP (PRP$ their) (JJ larval) (NNS stages)) (VP (VBP are) (ADJP (RB very) (JJ similar) (PP (TO to) (NP (NP (DT those)) (PP (IN of) (NP (NNS barnacles))))))))))))))))) (. .)))
The Rhizocephala are parasites of decapod crustaceans, and they have been widely assumed to be derived barnacles (Cirripedia) because their larval stages are very similar to those of barnacles.
(ROOT (S (NP (NNS Crustaceans)) (VP (VBP go) (PP (IN through) (NP (JJ different) (JJ larval) (NNS stages)))) (. .)))