( ( These flatworms ) ( typically ( ( ( occur ( in ( teleost fishes ) ) ) ( as ( sexually ( reproducing adults ) ) ) ) . ) ) )
(ROOT (S (NP (DT These) (NNS flatworms)) (ADVP (RB typically)) (VP (VBP occur) (PP (IN in) (NP (JJ teleost) (NNS fishes))) (PP (IN as) (NP (RB sexually) (JJ reproducing) (NNS adults)))) (. .)))
These flatworms typically occur in teleost fishes as sexually reproducing adults.
(ROOT (S (NP (JJS Most) (NN fish)) (VP (VB reproduce) (PP (IN with) (NP (CD one) (DT another))) (ADVP (RB sexually))) (. .)))