( ( ( The animals ) ( in ( this category ) ) ) ( ( ( ( include ( ( ( ( ( protozoans , ) ( small crustaceans ) ) , ) and ) ( ( the ( larval stages ) ) ( of ( larger organisms ) ) ) ) ) , ) ( while ( ( plant forms ) ( ( are mainly ) diatoms ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS animals)) (PP (IN in) (NP (DT this) (NN category)))) (VP (VBP include) (NP (NP (NNS protozoans)) (, ,) (NP (JJ small) (NNS crustaceans)) (, ,) (CC and) (NP (NP (DT the) (JJ larval) (NNS stages)) (PP (IN of) (NP (JJR larger) (NNS organisms))))) (, ,) (SBAR (IN while) (S (NP (NN plant) (NNS forms)) (VP (VBP are) (ADVP (RB mainly)) (ADJP (JJ diatoms)))))) (. .)))
The animals in this category include protozoans, small crustaceans, and the larval stages of larger organisms, while plant forms are mainly diatoms.
(ROOT (S (NP (NNS Crustaceans)) (VP (VBP go) (PP (IN through) (NP (JJ different) (JJ larval) (NNS stages)))) (. .)))