( Metanauplius ( ( is ( ( an ( early ( larval stage ) ) ) ( of ( ( some crustaceans ) ( such ( as krill ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Metanauplius)) (VP (VBZ is) (NP (NP (DT an) (JJ early) (JJ larval) (NN stage)) (PP (IN of) (NP (NP (DT some) (NNS crustaceans)) (PP (JJ such) (IN as) (NP (NN krill))))))) (. .)))
Metanauplius is an early larval stage of some crustaceans such as krill.
(ROOT (S (NP (NNS Crustaceans)) (VP (VBP go) (PP (IN through) (NP (JJ different) (JJ larval) (NNS stages)))) (. .)))